
The particles in a liquid are close together but not as close as in a solid, making liquids less dense. Even though they are slightly farther apart, the particles in a liquid cannot really be squeezed closer together, making liquids difficult to compress, which is why belly flops hurt.
Liquids are described as having an indefinite shape, but a definite volume, as they will not change size but can change shape based on they container they are put into.

When placed into a container, a liquid will take the shape of the bottom of the container, but remain the same volume.

Examples of liquids include: juice, water oil, milk, soda and vinegar.