Question

Explain two types of expansion in liquids. Why are there are two types of expansion in liquids?
[5 marks]

Answer 1

• When a liquid is heated in a container, heat flows through the container to the liquid; which means that the container expands initial, due to which the stage of the liquid falls.
  [1 mark]
• When the liquid gets heated, it expands more, beyond its original level. We cannot observe the intermediate state. This observed expansion of the liquid is known as the apparent expansion of the liquid.
  [1 mark]
• To estimate the apparent expansion, just fill a container until its brim with a given liquid and then heat the system. The volume poured out will be in the quantity of liquid that has apparently dilatated.
  [1 mark]
• Since the expansion of liquid is complicated because of the expansion of the container, it is, therefore, necessary to distinguish between the real and apparent cubic expansively of liquid. If we consider the expansion of the container also and measure the total expansion in the volume of the liquid, then the expansion is termed as the real expansion of the liquid.
  [1 mark]

Thus, liquid shows rwo types of expansion because when a liquid contained in a solid container is heated, the solid container undergoes expansion along with the liquid. [1 mark]