An instance of tangible stuff state type and a specialization of fluid substance; the collection of all portions of liquid. Each instance of liquid is a tangible thing that has similar properties to those exhibited by things in the liquid. Specifically, its volume is relatively constant at varying pressures, and it freely changes shape (e.g. to conform to the shape of its container). Liquids can never be said to break. Note that not all LiquidTangibleThings are in liquid : state-of-matter attributes (see state of matter) apply only to quantities consisting of a single type of substance, whereas liquids can be mixtures of different substances. Examples of LiquidTangibleThings include all substances in the liquid, such as the water in a room-temperature glass of beer; liquid/liquid mixtures like the beer itself; solutions of solids in liquids, such as sea water; emulsions, such as milk; and suspensions of solids in liquids, like blood. Compare fluid substance and gas.