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When you are a liquid and want to become a gas, you need to find a lot of energy. Once you can direct that energy into your molecules, they will start to vibrate. If they vibrate enough, they can escape the limitations of the liquid environment and become a gas. When you reach your boiling point, the molecules in your system have enough energy to become a gas. The reverse is true if you are a gas.
solid to gas is sublimation (dry ice) liquid to solid is freezing (like putting water in the freezer and getting ice) solid to liquid is melting (leaving ice on the counter and it turns to water) liquid to gas is boiling (a pot of water on the stove) or evaporation (water slowly 'disappears' from a glass)