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Liquids do not have any definite shape. But, it takes the form or shape of the container they are stored in. So, even though liquids have volume, they cannot be easily determined, like solids.
Measuring tools
A liquid may be poured into a graduated container to determine its exact volume easily. There are various measuring tools to find the volume of a liquid. Some of them are, Measuring cylinder Beakers

The capacity of these containers is determined by the maximum volume of liquid it holds. A liquid's volume is equal to the amount of space it takes up in the container. Therefore, the readings marked in the measuring containers directly shows the liquid's volume.
Unit for measurement
A $$litre$$ ($$l$$) 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 $$kilolitre$$ ($$kl$$).

The readings in the measuring beakers are usually marked in the unit of a $$millilitre$$ ($$ml$$). In terms of a $$millilitre$$,

$$1\ cl$$ $$=$$ $$10\ ml$$

$$1\ l$$ $$=$$ $$100\ cl$$

$$1000\ ml$$ $$=$$ $$1\ l$$

Important!
Some other units of volume to measure the liquids are,

$$1\ gallon$$ $$=$$ $$3785\ ml$$
$$1\ ounce$$ $$=$$ $$30\ ml$$
$$1\ quart$$ $$=$$ $$1\ l$$
Comparison with the units of length
Generally, if the object's dimensions are given in $$cm$$, then the unit of volume is written as a $$cubic\ cm$$ or $$cc$$.

One $$litre$$ ($$l$$) is equal to the volume of $$1000\ cc$$.
$$1\ l$$ $$=$$ $$1000\ cc$$ (or) $$cm^3$$

Liquids can be measured in $$litres$$ and can also be expressed in $$cubic$$ $$metre$$ or $$m^3$$.