What causes fog to burn off?



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    The of the sun causes fog to burn off, or rather the heat of the sun causes the little droplets of water that we see as fog to evaporate into water vapor. Fog forms when certain atmospheric conditions are appropriate, usually when the difference between temperature and dew point (the temperature to which water vapor needs to be cooled to form a water droplet) is less than 4 degrees F. So as the temperature rises, the water droplets evaporate into water vapor and the fog “burns off.”

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