G8

=Water =

__**Evaporation**__ 1) Evaporation is the process by which liquid change to gas. Evaporation occurs at any temperature. Approximately 80% of all evaporation is from the oceans, with the remaining 20% coming from inland water and vegetation.

2) Factors that affect evaporation is temperature of the surroundings, larger exposed surface area, the amount of wind and the humidity in the air. It also depends on concentration of other substances in the air and density. In hydrology, evaporation and transpiration are collectively termed evapotranspiration.

3) Evaporation is important to the water cycle as it helps the water from water bodies move up to the sky. Evaporation is also important to humans as without evaporation, our perspiration will not evaporate.

__**Boiling**__ 1) In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.

2) Boiling is the rapid [|__vaporization__] of a [|__liquid__], which occurs when a liquid is heated to its [|__boiling point__] , the [|__temperature__] at which the [|__vapour pressure__] at which the [|__vapour pressure__] of the liquid is equal to the pressure exerted on the liquid by the surrounding environmental pressure.

3) Alcohol boils at 74.4°C.

__**Condensation**__ 1) Condensation is when water in gaseous state turns to liquid state, when in contact with a cooler surface.



__**Melting**__ 1)Melting is when a solid turns into a liquid when the solid absorbs heat from the surroundings. 2)Ice melts at 0 degree celcius.

__**Freezing**__

1)Different liquids have different freezing point. 2) Water freezes at 100 Degree Celsius. 3)Mercury freezes at a temperature of 38.83 Degree Celsius 4)Alcohol freezes at -114 Degree celsius 5)Only liquids can freeze