2. Expansion of Liquids In liquids only expansion in volume takes place on heating.
( i) Apparent Expansion of Liquids When expansion of th container containing liquid, on heating is not taken into accoun then observed expansion is called apparent expansion of liquids.
Coefficient of apparent expansion of a liquid
( ii) Real Expansion of Liquids When expansion of the container, containing liquid, on heating is also taken into account, then observed expansion is called real expansion of liquids.
Coefficient of real expansion of a liquid
Both, yr, and ya are measured in ° C-1. We can show that yr = ya + yg
where, yr, and ya are coefficient of real and apparent expansion of liquids and yg is coefficient of cubical expansion of the container.
Anamalous Expansion of Water
When temperature of water is increased from 0 ° C, then its vol decreases upto 4 ° C, becomes minimum at 4 ° C and then increases. behaviour of water around 4 ° C is called, anamalous expansion water.
3. Expansion of Gases There are two types of coefficient of expansion in gases
( i) Volume Coefficient(& gamma; v) At constant pressure, the change in volume per unit volume per degree celsius is called volume coefficient.
where V0, V1, and V2 are volumes of the gas at 0 ° C, t1 ° C and t2 ° C.