When the temperature of a gas is kept constant, the volume of a fixed mass of gas is inversely proportional to its pressure.
`P prop 1//V`
(ii) (i) To start with, the liquid whose real and apparent expansion is to the determined is poured in a container up to a level. Mark this level as `L_1`.
(ii) Now, heat the container and the liquid using a burner as shown in the fiugre Initially, the container receives the thermal energy and it expands.
(iii) As a result the volume of the liquid appeares to have reduced. Mark this reduced level of liquid as `L_2`.
On further heating, the thermal energy supplied to the liquid through the container results in the expansion of the liquid. Hence , the level of liquid rises to `L_3`. Now, the difference between the levels `L_1 and L_3` is called as apparent expanision, and the difference between hte levels `L_2 and L_3` is called real expansion. The real expansion is always more than that of apparent expansion.
Real expansion = `L_3 - L_2`
Apparent expansion = `L_3 - L_1`.
