Nearly all of us have heated a pan of water with the lid on only to hear the lid rattle and hot water fall onto the burner moments later.
A liquid's molecules enter the gaseous phase when heated because they have enough kinetic energy to overcome the forces holding them in the liquid. By doing this, they produce a population of molecules in the vapor phase above the liquid, which leads to the creation of a pressure—the liquid's vapor pressure. The vapor was able to escape in the scenario we described because there was enough pressure to cause the lid to move. if a sealed vessel is used to hold the vapor.
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