Wednesday, March 30, 2011

English: The Verb 'Dare'

The verb 'dare' can be used to express different meanings. 
Meanings of the verb 'dare' : To have enough courage to do something and to actually do it, to challenge someone to do something dangerous or frightening.
Meaning: To have enough courage to do something and to actually do it
When dare is immediately followed by the verb, we may or may not use 'to' before the verb.
Examples:
Format: dare + to + verb: Would you dare to push an old woman into a hot oven?
Note: Verbs are highlighted in red, the verb I'm talking about will be highlighted in orange, special words will be highlighted in blue.
Format: dare + verb: Would you dare push an old woman into a hot oven?

In negative sentences using darewe do not use to before verb.
Example: Unless people accept the truth of my story, I dare not come out of hiding.

Meaning: To challenge someone to do something dangerous or frightening
Example: The journalist dared the old woman to tell her story on television.

The verb dare can be used to show that we are shocked and angry that someone has done something that they have no right to. The verb dare can also be used in exclamations to express outrage. Such sentences(that express outrage, earlier I've mentioned) begin with How dare.
Example: How dare they say such things about me! 

Don't you dare is used to express strong disapproval-telling someone that not to do something and letting them know that you are angry.
Example: Don't you dare eat any more of my cakes!

Extra: Change in Slideshow

Haha, for those who visit my blog would know that I used to have a SHINee slideshow because I'm a fan!!!! Unfortunately, I changed the settings for almost all pictures to be of Minho because he's my bias!!!! Hehe, for fans who want a slide show of their bias, using the slideshow gadget in my blog, you can request for it!!! Unless you're a desperate fan though.

Tuesday, March 29, 2011

Extra:Songs in my new playlist

These are songs in my playlist. You can ask for new songs (any will do, regardless of language) and I will add them in the playlist. PLEASE request them using the C-Box. Because there are too many songs in my playlist, so I had to write out this list for convenience purposes. This is how it is written.
Order: Song by Artist
Now here's the list!!!
  1. Nobody but You by BoA
  2. Nothing's Gonna Change by BoA
  3. Valenti by BoA
  4. Jewel Song by BoA
  5. Miracle by BoA
  6. Altantis Princess by BoA
  7. Tree by BoA
  8. Milky Way by BoA (Korean)
  9. Gift by BoA
  10. Make a Move by BoA
  11. So Much in Love by BoA
  12. The Show must go on by BoA
  13. The Lights of Seoul by BoA
  14.  B.I.O by BoA
  15. Shine We Are by BoA
  16. Be the One by BoA
  17. My Name by BoA
  18. Spark by BoA
  19. Stay in Love by BoA
  20. Dakishimeru by BoA
  21. Hurricane Venus by BoA
  22. Copy and Paste by BoA
  23. Game by BoA
  24. Everlasting by BoA
  25. Double by BoA (Korean)
  26. Don't Start Now by BoA
  27. My Sweetie by BoA
  28. Merry Chri by BoA
  29. Possibility by BoA
  30. White Wishes by BoA
  31. Eat You Up by BoA
  32. Key of Heart by BoA (Korean) 
  33. No.1 by BoA
  34. Be with You by BoA
  35. Hello by SHINee
  36. Lucifer by SHINee
  37. Replay
  38. Ring Ding Dong by SHINee (Live)
  39. Bad Girl(Boom Boom) by Super Junior (Live)
  40. Bonamana by Super Junior
  41. Steps to Stop by Super Junior
  42. She's Gone by Super Junior
  43. Every Heart by BoA
  44. Listen to my Heart
  45. Midnight Parade by BoA (Korean)
  46. Moon and Sunrise by BoA (Korean)
  47. Lollipop by BoA
  48. Woo Weekend by BoA
  49. Sara by BoA
  50. Sunshine by BoA
  51. Beat it by BoA
  52. Winter Love by BoA
  53. Autumn Letter by BoA
  54. My Prayer by BoA
  55. Feel Me by BoA
  56. Dangerous by BoA
  57. Waiting by BoA
  58. Make a secret by BoA
  59. Did Ya by BoA
  60. Touched by BoA
  61. Dress Off by BoA
  62. Do you love me by BoA
  63. Moto by BoA
  64. M.E.P (My Electronic Piano) by BoA
  65. Addiction by BoA
  66. Stand By by BoA
  67. Whatever by BoA
  68. Implode by BoA
  69. Adrenaline by BoA
  70. Don't Know what to say by BoA
  71. Romance by BoA
  72. Love Letter by BoA
  73. Best Friend by BoA (Live)
  74. I SEE ME by BoA
  75. Brand New Beat by BoA
  76. Sparkling by BoA
  77. Sweet Impact by BoA
  78. Do the Motion by BoA
  79. Eien by BoA
  80. The Love Bug/M-Flo loves BoA by BoA feat. M-Flo
  81. Energetic by BoA
  82. Pain-Love by BoA
  83. Happiness by BoA
  84. Realize(Stay with me) by BoA
  85. Azalea by BoA
  86. Feeling Deep Inside by BoA
  87. Share your love (with me) by BoA
  88. Happiness by BoA
  89. Snow White by BoA
  90. Next Step by BoA (Japanese)
  91. Sekai no Katsumi by BoA
  92. Winding by BoA feat. Dado
  93. Searching for truth by BoA
  94. Discovery by BoA
  95. Flower by BoA
  96. Beside You by BoA
  97. Feel the Same by BoA
  98. Time to Begin by BoA
  99. Beat of Angel by BoA
  100. Where are You by BoA
  101. Endless Sorrow by BoA
  102. One Way by BoA
  103. Always by BoA
  104. Kimochi wa Tsutawaru by BoA
  105. Konoyono shirushi by BoA
  106. Happy Birthday by BoA
  107. LA.LA.LA Love Song by BoA
  108. Scream by BoA
  109. My Only One by BoA
  110. I'M OK by BoA
  111. Romantic by SHINee
  112. Y.O.U (Year of Us) by SHINee
  113. Get it by SHINee
  114. Shout out by SHINee
  115. Obsession by SHINee
  116.  Love Pain by SHINee
  117. WOWOWOW by SHINee
  118. Electric Heart by SHINee
  119. A-Yo by SHINee
  120. Up and Down by SHINee
  121. Ready or not by SHINee
  122. Quasimodo by SHINee
  123. Your Name by SHINee
  124. Life by SHINee
  125. Love still goes on by SHINee
  126. Love should go on by SHINee(From Replay mini-album)
  127. In my room by SHINee
  128. Best Place by SHINee
  129. Talk to You by SHINee
  130. Hit me by SHINee
  131. Hot times by S.M the Ballad
  132. Miss You by S.M the Ballad

Saturday, March 26, 2011

English: Conditional Sentences

Hello visitors of the Revisioning Blog!(Though I call this Learning Blog) I will be posting this 'Conditional Sentences' post, it tells you of the different type of posts.This post is dedicated to my classmate who was unsure of the types of conditional questions, and I could also revise from it when I have no books.
First type of conditional sentences
To talk about something we will do in the future or something that is likely to happen really happened, we use will + verb. Use simple past tense in the 'if' half of the sentence.
Example: If I keep feeding you. I will not be able to feed the poor.

Sometimes 'unless' is used instead of 'If......not'. Do not use not in the 'unless' half of a conditional sentence; use not in the second half of the same sentence.
Example of usage of 'unless': Unless people accept the truth of my story, I will not come out of hiding.
Example of usage of 'If......not': If people do not accept the truth of my story, I will not come out of hiding.


Second type of conditional sentences
To talk about a situation that is not likely to happen or that is unreal, use would + verb. Use the simple past tense in the 'if' half of the sentence.


Examples: If what the children said about their stepmother was true, they would not dare return home.
If I wanted to eat meat, I would choose something other than such bony creatures.


In the second type of conditional sentences, were, weren't, was and wasn't can be used for I, he, she and it.
Example: If I were a cow, I would munch grass all day.
If I was a cow, I would munch grass all day.
When writing, we use 'I were',when speaking, both 'I was' and 'I were' are acceptable.  

Use were after I when we want to tell somebody what we think should be done, or giving opinions.
Example: If I were you, I wouldn't let strange children eat my house!

Third type of conditional sentences
Sometimes we talk about things that happened or did not happen in the past. We think of what would have happened if something did/did not happen.
The 'if' half of the sentence talks about things that have happened. It is too late to change these things. Use had + past participle. The 'would/wouldn't have' half of such sentences is to say what would have happened if things have been different in the 'if' half of the sentence. Use would/wouldn't have + past participle. 

Examples: If I had not made such a delicious house, I would not have been in this mess.

They would have left my house sooner if I had not cooked such delicious food.
To talk about a situation that did/did not happen in the past, use if + verb in past perfect tense in the 'if' half of the sentence. In the other half of the sentence, use would have + past participle of verb.

Use 'if only' to express regret.
Example: If only I had not listened to those wicked children in the first place, I would not be in this situation now.

Wednesday, March 23, 2011

Maths: Increase in Percentage

There are two methods actually. But I want to post this method because it is faster to solve the question. I will post the other method if you find this one too hard to understand. The question is taken from my workbook. No copyright infringement though.

Question: The temperature of a piece of metal was 32 degrees. It was then lowered into a glass of hot water and the temperature of the piece of metal increased to 36 degrees. Find the percentage increase in temperature of the piece of metal.

Step 1: Find the difference between 36 degrees and 32 degrees.
36 degrees-32 degrees = 4 degrees
Step 2: Put 4 degrees over 32 degrees. Then multiply this fraction by 100%.
4/32 x 100% = 12.5%


The method is easy, right? Only two steps. But it was somehow hard for me to remember in a way when I haven't put this in the blog.

Tuesday, March 22, 2011

What can affect the brightness of bulb(s) in a circuit?

  • The brightness of a bulb in a circuit depends on the:
         -arrangement of batteries
         -number of batteries
         -number of bulbs
         -arrangement of bulbs
Arrangement of Batteries

  • The batteries in a circuit may be connected in series not connected or parallel.
Batteries in series
  • When the positive pole of a battery is connected to the negative pole of another battery, the batteries are connected in series.
Batteries in Parallel
  • When the batteries in a circuit are arranged in parallel:
          - the positive poles of all the batteries are connected together, and then connected to one end of the circuit.    

              - the negative poles of all the batteries are connected together, and then connected to the other end of the circuit.


    Science: Electricity: Connections In a Bulb

    • When the metal tip and metal casing of the bulb is connected to different poles of the battery, the bulb lights up.
    • It is because there is a complete circuit for electric current to flow through.
    • The bulb will not light up if:
    -the metal tip of metal casing of the bulb is not connected to the battery.
    -the bulb blows
                

    Wednesday, March 16, 2011

    Chinese: Open-Ended Questions(理解问答)

    This is strictly for revision purposes, or rather, making my revision easier. No other intentions of posting this or other homework. This 'Open-Ended Questions' is from my homework. Some of these questions are based on the contents of the P6 textbook. I will post another 'Open-Ended Questions' post, but it comes from a book given by the school for practice. I will write the text first, then put the questions.
    第一课: 珍珠项链
              母亲生日那天, 我送给她一串珍珠项链, 并亲自给他戴上. 我们先逛街, 然后去餐馆吃饭, 我特意点了长寿面和母亲最爱吃的螃蟹.
              吃饭时, 服务员不小心把饮料洒在了母亲的衣领上. 母亲就去了一趟洗手间, 去了好久都没有回来. 我赶紧去找她.  在洗手间门口, 我看见母亲在跟一个穿短袖上衣的女孩儿说话,见我来了,女孩儿向母亲弯了弯腰,匆匆地走了. 我觉得有点儿奇怪, 但母亲什么也没说.
              回到家里,我才知道事情的经过.
              母亲在洗手间擦洗衣领时, 把项链摘了下来放在一边. 他擦洗干净后, 才发现项链不见了, 焦急的四处寻找. 当时厕所里只有她的和那个女孩儿, 那女孩儿神色慌张的正要出去, 母亲叫住了她.
                "对不起, 小姑娘, 打扰了."
                "干什么?" 女孩儿的脸色有些发白.
                "我的珍珠项链不见了, 这串项链是女儿送给我的. 虽然很普通, 但那是她省吃俭用, 用储蓄了半年的钱给我买的. 刚才我随手一放, 就不记得放在哪儿了. 要是找不到项链, 女儿一定会很伤心的. 你也帮我找找吧."
                 女孩儿看着母亲, 说: "我帮您找找."
                 母亲接过项链, 高兴地说: "就是它!谢谢你了!"
                  女孩儿连忙说: "不用客气. " 停了一下, 她又说: "谢谢您!"
                  就在这时, 我走了进来.
                  听到这里,  我问母亲: "她拿了您的东西, 您为什么不叫保安, 反而谢她呢?"
                  "她也许是家境贫穷才这么做的." 母亲慈祥地说, "要是我叫保安, 女孩儿就失去了一个改过自新的机会."
                   我的心微微一震......

    Tuesday, March 15, 2011

    Extra:Another Discovery!

    Hello! I found this video that have SHINee's 'Hit Me' and BoA's 'Key of Heart' and 'Waiting' MVs, and Super Junior's Donghae's in 'Key of Heart' MV! And also some videos of Donghae I think? To get the full picture, visit this youtube website:http://www.youtube.com/watch?v=Rb4OlYddpGQ&feature=related

    Monday, March 14, 2011

    A strange video

    There is this fan-made video that combines BoA's 'Hurricane Venus' and SHINee's  'Replay' Dance. Check this out in youtube: Link
    Go to the link!
    There is also some more videos of this sort: BoA's Did Ya + SHINee's Magic Dance
    BoA's Obsessed + SHINee's Magic Dance
    BoA's Energetic + SHINee's Magic Dance
    Super Junior's Sorry Sorry + SHINee's Magic Dance
    Taegoon's Superstar + SHINee's Magic Dance
    Super Junior's It's You+ SHINee's Magic Dance
    LOL. It's the funniest thing that I came across.
    P.S: SHINee's 'Magic Dance' is actually the dance of 'Replay', SHINee's debut song. Please do not mistake 'Magic Dance' for a song because of what I put.
    P.S.S: I know I'm not supposed to post this. This is just for fun and I wanted to share this with one of my classmates or maybe some others? I will post more Science and Chinese Posts. I will also label posts that have SHINee, BoA or Super Junior(or other K-pop/J-pop artists/singers) as Extra, from the next post of such content.

    Friday, March 11, 2011

    Science: Electricity: Different types of circuits

    Types of Circuits

    • Closed and open circuits
    • Series and parallel circuits
    • Short circuit(s)
    Closed circuit

    • An electric current can only flow if the circuit is closed or complete.
    • When the components of a circuit are joined to form a complete path for electric current to flow through, the circuit is called a closed circuit.
    • In a closed circuit, electric current flows from the battery, through the wires to the other electrical component(s) and back into the battery.
    • A circuit can only be complete when all the components are properly connected.
    • Electricity flows from the negative pole to the positive pole of a battery.
    Open circuit
    • When the components of a circuit are not properly connected, there may be a break/gap in the circuit.
    • When that happens, electric current cannot pass through the gap. The path that the electric current flows through is broken and the circuit is an open circuit.
    Series and Parallel circuits
    • A series circuit is a circuit with only one path for electricity to flow through.
    • If two bulbs are connected in a series and one of the bulbs is removed or is blown, the circuit will not work. This is because the circuit is open.
    • A parallel circuit has more than one path for electricity to flow through.
    • If two bulbs are connected in parallel, one bulb will work when the other is removed/blown. 
    • A bulb will not light up if the metal casing and the metal tip are connected to the same pole of the battery. The bulb will only light up when the metal casing and the metal tip are connected to different poles of the battery.
    Short circuit
    • (Short circuit is) A low-resistance, unintentional path, that bypasses part of a circuit. This can happen when two bare wires in a circuit touch each other. The part of the circuit bypassed by the short circuit ceases to function, and a large amount of current could start to flow. It could generate a lot of heat in the wires and cause a fire. As a safety measure, fuses and circuit breakers automatically open the circuit when excessive current is detected.

    Thursday, March 10, 2011

    Maths : Percentage: Finding original prices of things(for sale)

    This is an additional post. Actually, I am very familiar with this topic(finding original prices of things), except that I posted some things that I don't understand or wanted to post. But I thought that other people who would visit my blog might not understand about this, therefore, I posted this one.
    Question: A toy costs $4 after a 20% discount. Find its original price.
    Solution:
    100%-20%=80%
    $4 => 80%
    100% => $4/80 x 100 = $5

    Maths: Percentage:Continued from the first post of Maths.

    I break the Percentage facts into parts. This one is continued from my Maths post.
    Question: How many more percent of girls there are to boys.
    To find how many more percent of the girls to the percent of the boys:
    27(Girls)-23(Boys)= 4
    There are 4 more girls than boys.
    Express 4 over 23(use the number of boys as denominator), then multiply it by 100%.
    4/23 x 100% = 17.4%
    There are 17.4% more girls than boys.

    Maths: Percentage :Expressing in Percentage

    What I have learnt about Percentage. I'll take a question from my E-Learning Day Math Lesson.
    Question
    There are 27 girls and 23 boys in Person A's class.
    a) Find the percentage of girls in Person A's class. 
    b) Find the percentage of boys in Person B's class.
    Solution(for A)
    Find the total number of students.
    27+23=50
    Then, put the number of girls over the total number of pupils. It will create a fraction: 27/50


    Multiply the fraction by 100%. 
    27/50  x 100% = 54%

    The percentage of girls in Person A's class is 54%
    Solution(for B)
    There are two methods.
    Method 1
    100%-54%=46%
    Method 2
    23/50 x 100% = 46%


    Science: Electricity : Components of an electric circuit

    Battery(batteries)
    • A battery has a negative pole and a positive pole.
    • When the two poles of the battery(batteries) are connected in an electric circuit, electricity flows through the circuit. 
    Wires
    • Electricity flows from one component to another through wires.
    • Wires are usually made of copper because it allows electricity to pass through easily.
    • Wires are covered with electrical insulators such as plastic or rubber to prevent the electric current from leaking out of the circuit.
    Switch

    • A switch is used to control the flow of electricity in a circuit.
    • A switch either break or completes an electric circuit.
    • When the switch is open, there is a gap/break in the electric circuit and electric current cannot flow through the circuit.
    • When the switch is closed, electric current can pass through the electric circuit, the circuit is complete.
    Bulb
      A bulb is an electrical device that is often used in a circuit.
      The bulb consist of:






      • 1)Glass bulb-it prevents filament from getting damaged.
      • 2) Inert gas(Argon). It is a non-reactive gas and does not react with the filament at high temperatures.
      • 3) Filament-Made of tungsten, it produces light and heat when electricity pass through.
      • 4/5/6/7/8)Wires-connects filament to metal tip and metal casing.
               9/10)Metal casing-Connected to other components of the electric circuit.
               11) Metal tip-Connected to other components of the electric circuit.

      Wednesday, March 9, 2011

      Science: Electricity : What is an electrical system?

      What is an electrical system?

      • Electricity is a form of energy.
      • It can be used in electrical equipment to produce other forms of energy like heat and light.
      • The path through which electricity flows is the electric circuit.
      • Things that use electricity have a number of components inside them.
      • These components make up an electrical system.
      Components
      -energy source
           -batteries(they are convenient sources of electrical energy) (comes in different shapes and sizes)
           -power stations
      -wires
      -bulb(s)
      -switch

      Science: Why is the Water Cycle important?

      Why is the Water Cycle important?
      All living things need water to stay alive.
      The water cycle is the only natural way to refresh water, ensures a constant supply of fresh water for living things on the Earth.
      Digestive system-water is needed to digest food, to absorb digested food and to pass out waste.
      Respiratory system-Water is needed for gaseous exchange between the lungs and the air we inhale.
      In lungsair sacs called alveoli are surrounded by a thin layer of water.
      Oxygen dissolves in this layer of water before entering the blood.
      Carbon dioxide dissolves in this layer of water before it is released into the alveoli and exhaled.

      In the circulatory system, water is needed in the blood to carry oxygendigested food, nutrientscarbon dioxide and waste materials.

      Body system need water to function properly => gives us signals(thirst) => we get thirsty.

      Notice

      This blog is created for my convenience. I like to surf the Net and I do it everyday. Therefore, to refrain from my father's nagging, I created this blog for quick revision. There are certain rules on how to use it and people of my age will definitely enjoy this blog.
      How to use this blog
      1. For daily revision, read the daily posts that I post. Go to this website daily for new posts of what I've learnt, mostly facts/things I have learnt from school.
      2. If your exams are round the corner, you might want to revise the conclusions for any topic.
      3. Lastly, if you have any questions, please feel free to ask! I would reply as soon as possible as I would have to do daily updates.

      Conclusion of 'Water and Its Three States'

      This is a conclusion of 'Water and Its Three States'. I will be doing 'Electricity' next. Note that this conclusion is about water, I would not put everything I have posted. I will only put some important facts for the exam.



      • Water expands as it freezes to ice.
      • Solids(ice) have definite shape and definite volume.
      • Liquids(water) have no definite shape but have definite volume.
      • Gas(air) have no definite shape and no definite volume.  
      • Water loses heatevaporates(at any temperature, below freezing point) and become water vapour.(water =>air)
      • Water loses heat, freezes(at 0 degrees) and become a solid(ice) (water => ice)
      • Water gains heatboils(at 100 degrees) and become steam.
      • Ice gains heat and melts, to become water.
      • Steam/Water vapour lose heat, condenses and becomes liquid(water).
      • Conditions for photosynthesis: Light, Water and Carbon Dioxide.
      • The Water Cycle ensures a constant supply of water for all living things of the Earth.
      • Water droplets => visible
      • Water vapour => invisible
      • Water, air and solids occupies space and have mass. They are matter.
      Factors that affect rate of evaporation
      Low Humidity, High temperature, Area of exposed area and Presence of Wind.
      Water cycle
      Water cycle in Earth
      1. Water evaporates from the ground and water bodies, living things also release water vapour into the air through respiration.
      2.Warm air cools as it rises to the sky =>Water vapour in warm air condenses into tiny water droplets => gather to form clouds.
      3.Water droplets become big and heavy =>fall as rain, snow or hailRain falls onto Earth as fresh water.
      4. Back to step 1.( Cycle continues)



      You might want to revise my daily posts for one more time.



      Science: Conservation of Water

      • Although oceans and seas have a lot of water, it is not suitable for drinking.
      • As we have a limited supply of usable water, we should be careful on how we use it.
      • Water conversation = the careful use of water to avoid its wastage
      • To ensure that the available supply of water last longer, we conserve them.
      • Water conversation can be promoted through campaigns, posters and water rationing exercises.
             Water rationing - the controlled distribution of water to people when there is a shortage of water.
                                      - we don't get water from our taps.
                                     - we use our buckets to collect water from a water distribution centre.
                                     - each person is given a certain amount of water.
        
                                    

        Science: Pollution of Water

        • Water pollution occurs when harmful substances get into water and makes it unfit for use.
        • Polluted water bodies can be unsightly and may give off foul-smelling gases.
        • Some forms of water pollution can endanger or even kill plants and animals.
        • When water is polluted, it is no longer clean or safe to use.
        • Polluted water needs to be treated before it can be used. It requires time and money.
        •  Littering and dumping of waste, oil spills and deforestation are common causes of water pollutions. 

        Science: Why is water a precious resource?

        • Water is important, but it is a limited resource on the Earth.
        • Although 3/4 of the Earth is covered by water, only 1% of the water is suitable for consumption.
        • Most of the water exists in the solid state as icebergs and glaciers, while some is collected underground as groundwater.
        • Water also exists in the atmosphere as water vapour and in cold regions as ice and snow
        • Oceans, seas, lakes, ponds, rivers and wells are sources of water.

        Science:Water Cycle

        The water cycle is the continuous movement of water on Earth.
        Heat energy from the Sun causes water on the earth to evaporate, forming water vapour.
        Water cycle in Earth
        1. Water evaporates from the ground and water bodies, living things also release water vapour into the air through respiration.
        2.Warm air cools as it rises to the sky =>Water vapour in warm air condenses into tiny water droplets => gather to form clouds.
        3.Water droplets become big and heavy =>fall as rain, snow or hail. Rain falls onto Earth as fresh water.
        4. Back to step 1.( Cycle continues)

        Clouds
        Clouds provide us with rain, snow or hail = fresh water.
        Clouds also help to reduce the effect of the Sun's direct rays on the Earth.
        Clouds are made up of tiny water droplets, clouds in liquid state. 
        Water droplets = visible
        Water vapour = invisible
        Snow
        Snow = made up of snowflakes
        Air temperature drops below freezing point(0 degrees) => water droplets in clouds freeze =>snowflakes are formed.
        Hail
        Hail = frozen rain or hailstones that fall from the sky, usually during summer thunderstorms.
        Temperature near top of clouds is low. Water droplets freeze when they are there(near top of clouds) 
        Air movements inside the clouds carry the frozen water droplets up and down a lot of times within the clouds. Each time they rise, another layer of ice forms around them. 
        Frozen water droplets become too heavy to be carried by air movements => fall as hailstones 


        Frost
        Temperature of ground is below freezing point => air above ground becomes very cold =>water vapour (in the air) freezes into tiny crystals => crystals form a sparkling white coat of frost on the ground and trees.




        The need for water in plants
        Water plays an important role in carrying out life processes in plants.
        Sufficient water for a seed would activate life processes within the seed and germination occurs
        In the plant transport system, water helps in movement of substances within the plant.
        Conditions for photosynthesis: Water, Light and Carbon dioxide

        Tuesday, March 8, 2011

        Science:Factors that affect Rate of Evaporation


        Rate of evaporation indicates how fast or slow evaporation is taking place.

        Factors affecting rate of evaporation: temperature, presence of wind, area of exposed surface and humidity(in the air).



        Temperature
        The temperature of the water and its surroundings affect the rate of evaporation.
        The higher the temperature, the faster the rate of evaporation.

        Presence of wind
        When water evaporates, the water vapour it forms usually collects just above the water surface.
        When wind blows, it takes away the water vapour and creates space for more water vapour to form.
        The stronger the wind, the faster the rate of evaporation.

        Area of Exposed Surface
        The area of exposed surface=the area of water that is exposed to air.
        Water vapour goes into the air from this surface.
        Humidity of The Air
        Humidity is the measure of the amount of water vapour in the air.
        The lower the humidity of the air, the faster the rate of evaporation.

        Monday, March 7, 2011

        Science: Water and Its Three states.

        "Taken from my textbook and PSLE Science Guide(2nd Edition), I complied some facts about 'Water and Its Three states' and decided to put this in this blog. I will be putting more facts from now on to make my revision easier and maybe put in English, Chinese and Maths, or even Korean, just the things I learnt, and upload it here. Note that the facts I upload is according to these 2 books and the facts are random.


        Water and Its Three states:
        Solids(ice) have definite shape and definite volume.
        Liquid(water) have definite volume but no definite shape.
        Air, or rather, gas, have no definite shape and no definite volume.
        Water, air and solids(besides ice), are matter because it has mass and occupies space.
        Water is able to change from one state to another by gaining and losing heat.

        Freezing point of water and melting point of ice is 0 degrees.

        Heat loss(Condensation):
        Condensation = change in state of water from a gas(steam or water vapour) to a liquid(water) due to heat loss. It can occur at any temperature.
        Steam is hot water vapour at 100 degrees. Like water vapour at any other temperature, it condenses when it meets a cooler suface.

        Heat Gain-Melting(Solid to liquid)
        When ice melts, it is gaining heat. However, the heat is used to help the particles in ice to break away from each other. Thus, the temperature of melting ice remains at 0 degrees, until all the ice has turned into water.

        Heat Gain-Boiling(Liquid To Gas)
        When water gains heat=> temperature rises.
        Boiling= change in state of water from a liquid to a gas(steam) due to heat gain.
        The boiling point of water is 100 degrees.
        Water boils=>water gain heat. heat used=>the particles in water break away from each other. The temperature of boiling water remains at 100 degrees, until all the water has turned into steam.
        Steam condenses =>water droplets form=> white clouds are observed
        Steam is invisible.

        Heat Gain-Evaporation(Liquid to Gas)
        Evaporation->change from liquid(water) to a gas(water vapour) due to heat gain.
        Evaporation happens all the time at any temperature below boiling point(100 degrees).

        Evaporation=>happens all the time below 100 degrees
        Boiling=>happens when water is heated up to 100 degrees.

        Evaporation produces a cooling effect.
        Water evaporates=>gains heat from its surroundings=>surroundings lose heat => produces a cooling effect.