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I believe I can improve upon this answer for you. When water turns into a gas, the process is called evaporation. When water, in the form of gas, returns to a liquid state, the process is called condensation.

In a closed container, there are equal amounts of evaporation and condensation, regardless of temperature. However, in an open container (i.e. outside), the higher the temperature becomes, the more likely molecules of water will be able to escape into the air (gas form).

Why can this happen when water is not boiling? The humidity, temperature and altitude outside determine if water evaporates/condensates. We call this set of conditions the "dew point."

Water molecules, like the molecules of everything, are always in motion. Even at low temperatures (above freezing), the molecules that are moving around can break free and escape into the environment where there is lower pressure, becoming water vapor.

When the dew point is lower than the ambient conditions, the conditions are right for water to escape. When the dew point is higher than the ambient conditions, the conditions are right for water to condensate and during this time, evaporation cannot take place.

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