Dew point
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What is dew point?
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Are you looking for a definition? If so, here is the deal. Atmospheric air contains water vapor. There is a limit to the amount of water vapor that air can contain, which depends on pressure and temperature. When the amount of water vapor contained is at the limit, we say the air is saturated. Dew point is the temperature at which the will become saturated. As air cools below its dew point, moisture condenses to form liquid water.
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The bottom line is - should the outside air temperature decrease to equal the "dew point" temperature, dew will form on grass or leaves.
Should the dew point temperature be the same as the outdoor air temperature, the air is 100% saturated with moisture. Theoretically the air can't hold any more moisture.
Should more moisture moves in or the out door temperature decreases then either clouds or fog will form - moisture droplets become visible.
From there, should even more moisture advect in or the air temperature falls (cools even more) visible tinny moisture droplets will increase in size and eventually become so heavy, they will fall to the ground as rain. -
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