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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.
Below that pressure, if you cool a gas down, it will do something called crystal lattice formation and go straight from a gas to a solid. The boiling point for a liquid will also drop at lower pressures. In fact, you can actually get a liquid to boil at room temperature if you have a vacuum. If you want to see this for yourself, heres an experiment you can try: go to a doctor or veterinarians office and ask if you can borrow a syringe (you dont need a needle). Suck a bit of water into the syringe.