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Just in case you are wondering what MESS is about,
it is a collaborated educational blog.

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This blog is officially opened in 21 August 2009




-10 Recent Posts-
P4 chapter 1: Matter & its 3 states
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P3 Science Chapter 12: The Skeletal & Muscular system
P3 Science Chapter 13: Magnets
Chapter 1 : Cross Academy: Night class


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Monday, August 24, 2009
P4 Chapter 2: Water and Changes of States @ 10:39 PM

P4 Chapter 2 : Water and Changes of States

1) Freezing: Liquid => Solid

At 30 degree celsius, water exists in liquid state. When it becomes 0 degree celsius, water changes to ice. Water loses heat to the surroundings until it falls to 0 degree celsius during freezing

0 degree celsius = freezing pt. of water

2) Melting: Solid => Liquid

When ice gains heat from its surroundings, it will eventually become a liquid. When salt is added to ice, it becomes an impure substance and the melting point is lowered to -5 degree celsius.

3)Evaporation: Liquid => Gaseous

It occur at a temperature below a boiling point(100 degree celsius) of a liquid.

Rate Of Evaporation

Factors affecting the R.O.E:
  • Temperature
The higher the temperature, the faster the R.O.E.
  • Surface Area
The larger the surface area, the faster the R.O.E.
  • Wind
Water evaporated at a faster rate in the presence of wind.
  • Humidity (amt. of water vapour in the air)
The R.O.E. is faster when humidity is low.



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