Evaporation
Conversion of liquid into vapour at all temperatures( even below boiling point) is called evaporation.
Boiling
When a liquid is heated gradually, at a particular temperature saturated vapour pressure of the liquid becomes equal to atmospheric pressure, now bubbles of vapour rise to the surface d liquid. This process is called boiling of the liquid.
The temperature at which a liquid boils, is called boiling point The boiling point of water increases with increase in pre sure decreases with decrease in pressure.
Sublimation The conversion of a solid into vapour state is called sublimation. Hoar Frost The conversion of vapours into solid state is called hoar fr.. Calorimetry
This is the branch of heat transfer that deals with the measorette heat. The heat is usually measured in calories or kilo calories.
Principle of Calorimetry
When a hot body is mixed with a cold body, then heat lost by ha is equal to the heat gained by cold body.
Heat lost = Heat gain Thermal Expansion
Increase in size on heating is called thermal expansion. There are three types of thermal expansion.
1. Expansion of solids 2. Expansion of liquids 3. Expansion of gases