Gases have two coefficients of expansion — why?

What is the unit of coefficient of expansion of solid in Sl system ?

Is the value of the coefficient of expansion of a gas the same for all gases?

Statement I : The coefficient of apparent expansion can be negative. Statement II : Coefficient of real expansion of a liquid can be less than the coefficient of expansion of vessel.

Write the unit of coefficient of real expansion?

Write the value of coefficient of real expansion of water?

The coefficient of real expansion of mercury is gamma and the coefficient of linear expansion of glass is alpha . The mercury thread, enclosed in a glass tube of uniform bore, expands linearly due to rise in temperature. The effective coefficient of expansion will be

What is the value of coefficient of real expansion of Paraffin oil?