5. The point at which the relative humidity reaches 100% is the and (2 points)
the air can hold no more water vapor.

The dew point is the temperature the air needs to be cooled to (at constant pressure) in order to achieve a relative humidity (RH) of 100%. At this point the air cannot hold more water in the gas form.

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Explanation:

relative humidity is related to the partial pressure of water vapor in the air at 100% humidity the partial pressure is equal to the vapor pressure and no more water can enter the vapor phase.

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