Thus, liquid mixtures contain substances that in their pure form may themselves be liquids, solids, or even gases. Even though in pure form these salts are solids, in oceans they are part of the liquid phase. Seawater is a liquid mixture in which a variety of salts have been dissolved in water. Such mixtures include those fluids essential to life-blood, for example-beverages, and seawater. On Earth, water is the most abundant liquid, although much of the water with which organisms come into contact is not in pure form but is a mixture in which various substances are dissolved. Liquids may be divided into two general categories: pure liquids and liquid mixtures. Solids retain both their shape and volume when moved from one container to another. Gases, for example, expand to fill their container so that the volume they occupy is the same as that of the container. These properties serve as convenient criteria for distinguishing the liquid state from the solid and gaseous states. Furthermore, when a liquid is poured from one vessel to another, it retains its volume (as long as there is no vaporization or change in temperature) but not its shape. When a liquid substance is poured into a vessel, it takes the shape of the vessel, and, as long as the substance stays in the liquid state, it will remain inside the vessel. The most obvious physical properties of a liquid are its retention of volume and its conformation to the shape of its container. Liquid, in physics, one of the three principal states of matter, intermediate between gas and crystalline solid.
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