Substances can exist as different physical states, and change from one physical states to another. At different states, the particles have different kinetic energy. Compared to solids, liquids have particles with greater kinetic energy.
A solid has high density. A liquid has a higher density than gas but a lower density than solid. A gas has low density.
A Solid:
Cannot be compressed
Has a fixed volume
Has a fixed shape
High Density
A Liquid:
Cannot be compressed
Has a fixed volume
Has no fixed shape
Higher Density than Gas, but lower than Solid
Therefore, a solid's particles are packed together closely in an orderly arrangement. They are held to together by forces of attraction. They are able to vibrate about their fixed positions but are not free to mover amongst each other.
A liquid's particles are packed to together quite close together but not in an orderly arrangement. They are held together by forces of attraction. They have more energy than solids. They are able to move by rolling and gliding.
A gas' particles are far apart from each other in a random arrangement.
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