![]() If you put that liquid drop in the freezer, it would become a solid piece of ice. That vapor (or gas) can condense and become a drop of liquid water in the cooler air. There is water vapor above a pot of boiling water. When molecules move from one phase to another they are still the same substance. If you place a glass of water in a vacuum chamber and lower the pressure, you can begin to watch the water boil and the water molecules move to a gas phase. If you place a glass of liquid water on a table, it will just sit there. If energy is added (increasing the temperature) or if energy is taken away (freezing something), you can create a physical change.Ĭhanging the pressure of a system is another way to create a physical change. Matter only moves from one phase to another by physical means. "Phase" describes the physical state of matter. You are able to smell the volatile compounds that are mixed in the air around you. Have you ever noticed that you can smell a turkey dinner after it starts to heat up? As the energy of the molecules inside the turkey heat up, they escape as a gas. The extra energy allows the molecules to change states. If you give a liquid water molecule enough energy, it escapes the liquid phase and becomes a gas. When the temperature of the water goes up, the molecules get more excited and bounce around a lot more. Let’s say you have a glass of water (H 2O). If enough energy is pushed into a system, a phase change may occur as the matter moves to a more active state. For example, when the temperature of a system goes up, the matter in the system becomes more excited and active. How does matter change from one state to another? Elements and compounds can move from one state to another when specific physical conditions change. Each of these states is also known as a phase. Solids are often hard, liquids fill containers, and gases surround us in the air. ![]() Solids, liquids, gases, plasmas, and Bose-Einstein condensates (BEC) are different states of matter that have different physical properties. We look at five states of matter on the site.
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