A solid has definite volume and shape, a liquid has a definite volume but no definite shape, and a gas has neither a definite volume nor shape.
A solid is defined as a state of matter with a definite shape and volume. In contrast, liquids can change shapes, while gases can change both shape and volume. The particles in a solid (atoms, molecules, ions) are tightly-packed compared to liquids and gases. The arrangement may be a regular lattice called a crystal or an irregular arrangement called an amorphous solid.
Properties of solids include:
Anything with a fixed shape and volume is an example of a solid. Examples of solids include:
Examples of things that are not solids include air, water, liquid crystals, the elements mercury and helium, and steam.
A liquid is a state of matter that has a definite volume, but no fixed shape. In other words, a liquid takes the shape of its container. Liquids consist of atoms or molecules that are loosely connected by intermolecular bonds. In contrast, the atoms or molecules in a solid are fixed in a rigid shape, while the particles in a gas are separated by great distances. Most liquids resist compression. Liquids have surface tension, so they can wet surfaces.
Here are examples of liquids at room temperature and pressure.
Liquids share common properties.