Solid molecules simply vibrate and rotate in place rather than move about. Solids are generally held together by ionic or strong covalent bonding, and the attractive forces between the atoms, ions, or molecules in solids are very strong.
Liquid
A liquid is a fluid. Unlike a solid, the molecules in a liquid have a much greater freedom to move. The forces that bind the molecules together in a solid are only temporary in a liquid, allowing a liquid to flow while a solid remains rigid. A liquid, like a gas, displays the properties of a fluid.
Gas
Gas molecules are made up of a number of atoms bonded to one another. These interatomic bonds are similar to springs connecting atoms of various masses together. This bonding vibrates with a fixed frequency called the natural frequency.
