Matter changes phases when it transforms from one state to another, such as from a liquid into a gas. Explore the definition, types, and examples of phase changes of matter. Understand how to define matter, and recognize that matter can experience up to eight phase changes, including condensation, sublimation, and ionization. Updated: 10/11/2021
Definition of Phase Changes of Matter
By definition, matter is anything that has mass and takes up space. Matter exists as solids, liquids, gases, and plasma phases or states. A solid is any matter in a form that has a definite shape and volume. This means that no matter where you put a solid, its shape and volume will stay the same. A liquid is any matter that has a definite volume but no definite shape. This means that liquids retain their volume but take the shape of the container that is holding them. A gas is any matter that does not have a fixed shape or volume. Gases take the shape of their container and can expand or contract to change their volume. Plasma is matter that exists in the form of high energy charged particles.
A phase change is a transition of matter from one state to another. Phase changes occur regularly in nature and can be conducted by people. The phase in which matter exists is determined by the pressure and temperature of its surroundings. By manipulating the pressure and temperature, you can change the phase of the matter.
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