Liquid

Liquid is a state of matter in which the constituent molecules are not constrained in their relative location to each other. In the way it flows, a liquid behaves similarly to a gas. Unlike a gas it occupies a nearly fixed volume, regardless of the pressure. Where in contact with a gas, a liquid will be bounded by a well-defined surface, whose strength is described by a property called surface tension. Surface tension is responsible for most of the phenomena we associate with liquids, including wetting to surfaces, and the tendency of small droplets to form spheres.

Water is a well known liquid at room temperature and pressure.