![]() If it is removed from a freezer and placed in a warm pan, the ice warms up and changes to the liquid-water. At constant atmospheric pressure the state of water, for example, changes with changes in temperature. But if the temperature or the pressure changes, its state may also change. A gas expands to fill the complete volume of its container.Īt a given temperature and pressure, a substance will be in the solid, liquid, or gaseous state. A pint of water changes its shape when it is poured from a glass into a bowl, but its volume remains the same. A liquid, unlike a solid, assumes the shape of its container, even though, like a solid, it has a definite size, or volume. ![]() A pencil, for example, does not change in size or shape if it is moved from a desktop and placed upright in a glass. ![]() Solid matter generally possesses and retains a definite size and shape, no matter where it is situated. Most of the matter that people ordinarily observe can be classified into one of three states, or phases: solid, liquid, or gas.
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