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Fog or clouds.

Air is able to hold a certain amount of water vapor in the atmosphere, and the amount is dependent on the temperature and pressure of the air. Higher temperature air can contain more transparent water vapor than colder air can. We calculate the "relative humidity" of the air as the ratio of how much water the air DOES contain divided by the maximum amount of water that the air could contain, for a given temperature.

When air cools, the absolute amount of water contained in the air does not change, but the air's ability to hold it decreases. So as air cools, the "relative humidity" increases. We can also calculate the temperature at which the air is at 100% relative humidity; that is to say, the air can't hold any more water. We call this temperature the "Dew Point".

When the air cools down to the "Dew Point", moisture in the air begins to condense onto cooler surfaces, and we call these droplets of water on the grass and trees "dew". If the water condenses into tiny droplets in the air, it will form fog on the ground, or clouds above the ground surface.

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