Why don't liquids have fixed shape?

Liquids have a fixed volume but no fixed shape. This is because the particles in a liquid are further apart than the particles in a solid, allowing them to easily slide past each other. The fact that they can easily slide past each other allows the liquid to take on the shape of any container it is poured into.

Solids have a fixed shape because their molecules are so tightly packed they cannot do much more than vibrate against each other. Solids aren’t compressible and neither are liquids—however, gas is easily compressible.

Liquids have a fixed volume but no fixed shape because liquid particles are not so tightly constrained and have spaces in between them and are free to move compared to solids. Liquids do not have a fixed shape, but rather, they take the shape of the container in which it is placed.

The molecules are positioned in such a way that they can freely move around. Unlike a solid, liquids can continuously change shape. A liquid is nearly incompressible, meaning that it occupies nearly a constant volume over a wide range of pressure. A liquid displays the properties of a fluid.