The suns rays, heating down on the oceans, lakes, and rivers of the earth, cause the surface water to evaporate and enter the surrounding atmosphere. When the amount of vapor is great, we feel uncomfortable and say that it is humid. At any particular temperature the air can hold only a certain amount of water vapor. If the air is holding a maximum amount of vapor, no more water can evaporate. The meteorologist also says that the humidity at such a time is 100%.
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