In liquid matter, atoms or molecules are free to move relative to each other giving liquids a fixed volume but not a fixed shape.
In science, a liquid can be described as a substance that flows in a free manner but also has a fixed volume.
The reason that liquids have a fixed volume is that there is relativity present among the atoms of a liquid substance. The atoms in a liquid are close together and hence have a fixed volume.
The reason that liquids do not have a fixed shape is that the atoms or particles in a liquid can move freely. Hence, they do not have a shape of their own and tend to take the shape of the container in which they are present.
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