An element can be a solid, liquid or a gas depending on how high or low the temperature or pressure is. Since solids are super crowded together and the slowest moving molecules they would need to have the lowest temperature and the highest pressure out of the three. Liquid molecules are separated enough for them to move around faster than a solid, but slower than a gas. Liquid is created by not being too cold to become a solid, or too hot to become a gas, but rather in between the two. Gas molecules have a lot of space between each other and move really fast. To create a gas you need really low pressure but high temperature. Using certain amounts of Pressure and Temperature, you can change the matter between solid, liquid and gas.
When Gas turns into a Solid it's called Deposition. When Solid turns into a Gas it's called Sublimation. When Solid turns into a Liquid it's called Melting. When Liquid turns into a solid it's called Freezing. When Gas turns into a Liquid it's called Condensation. When Liquid turns into a Gas it's called Vaporization.
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December 2016
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