### Theory:

Liquids take the form or shape of the container they are stored in.

Unit for measurement

A $$litre$$ is a unit of measurement used to express the volume of liquid. For example, $$1\ - litre$$ milk packet, $$20\ litres$$ water can and so on. Other units are $$millilitre$$ ($$ml$$), $$centilitre$$ ($$cl$$), and $$kilolitre$$ ($$kl$$).
Measuring tools
A liquid may be poured into a graduated container to easily determine its exact volume.

An average adult has $$5$$ to $$6\ litres$$ of blood in his body. However, depending on their age, the amount varies from person to person.