Question

Coefficient of real expansion of the liquid is defined as the ratio of real change in the volume to its
original volume per 1℃ rise in temperature. Type 1 for true and 0 for false.

Answer 1

The tendency of a matter to change its volume because of the change in temperature is called
thermal expansion. Substances expand or contract on change in temperature which causes volume
expansion. The volume expansion is of two types, real and apparent volume expansion of a liquid.

Complete step by step answer:
When heat flows through a container containing liquid, the heat first reaches the container due to
which it expands then the heat reaches the liquid resulting in its expansion.

The apparent expansion means the expansion of the liquid kept in the container without taking into
account the expansion of the container.
While real expansion takes into account the expansion of the container along with the expansion of
the liquid.

Real expansion of liquid = apparent expansion of the liquid + volume expansion of container
Thus as the name suggests, the ratio of real change in the volume to its original volume per 1℃ rise in
temperature is called the coefficient of real expansion of the liquid.
Hence, the statement given in the question is True.

Note:
Due to the increase in temperature, the heated molecules move faster and take up more space
causing thermal expansion. The ratio of apparent change in volume to its original volume per 1℃
rise in temperature is called the coefficient of apparent volume expansion. The S.I. unit of both
coefficient of real change and that of the apparent change is per℃.