Every time I read about it it trails into complex physics
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It’s the temperature your glass of water needs to be for water to form on the outside of the glass.
As others noted, air can hold more or less water in it largely based on the temperature. So in a given place and time, there is a temperature where the water will come out of the air. You can see it on your glass of ice water amd on the grass or your car some mornings,.
On hot days, the dew point will impact how hot you feel (think heat index). The more humid it is, the higher the dew point, and generally the more uncomfortable you are in a given warm temperature.
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