Friday, September 5, 2008
Melting
>solid changes to liquid upon heating
>for pure substance,it occurs at a definate temperature known as melting point
>for ice,melting point is 0 degree(constant temp. for ice to melt to become water)
>during changing of states,no change in temp.
Solidification
>reverse process of melting
>changing from liquid to solid
>pure substance solidify at the temperature equal to its melting point
>0 degree is freezing point of water
>during state of change from liquid to solid,no change in temp.
Boiling
>pure liquid heated,changes to vapour at fix temp.(change of state:boiling)
>this particular temp. is known as boiling point
Condensation
>reverse process of boiling
>change of state from vapour to liquid
Evaporation
>change of state from liquid to gas
>can occur at any temp.
>requires thermal energy from surroundings
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some comic i found on melting
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>melting & boiling graph
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