Liquid is one of the three classical states of matter. Like a ? gas, a liquid is able to flow and take the shape of a container, but, like a ? solid, it resists compression. Unlike a gas, a liquid does not disperse to fill every space of a container, and maintains a fairly constant density. A distinctive property of the liquid state is ? surface tension, leading to ? wetting phenomena. The density of a liquid is usually close to that of a solid, and much higher than in a gas. Therefore, liquid and solid are both termed condensed matter. On the other hand, as liquids and gases share the ability to flow, they are both called ? fluids.

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