Properties Of liquid
vapour Pressure
Is the Pressure exerted by the vapours on the surface of the liquid at a particular temperature.When rate of evaporation equals to rate of condensation.If temperature is increased vapour pressure also increases.
Evaporation
The process of escaping of liquid molecules from the surface of the liquid .It will take place at any temperature and its a surface phenomena.evaporation causes process cooling effect because of the time of evaporation surface molecules takes energey from the remaining molecules to escape so energy of the remaining molecule decreases.
Boiling point
The process of escaping of molecules from the bulk of liquid is called boiling poin..It will start at a particular called boiling point.Boiling point is the temperature at which vapour pressue of the liquid becomes equal two the atmospheric pressure.At the top of the hill boiling point of water decreases because at the top atmospheric pressure is low.