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 Expansion of Solids Three types of expansion -takes place in solid .
Linear Expansion Expansion in length on heating is called linear expansion . Increase in length
l2 = l1 ( 1 + α Δt )