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Application Note Introduction to Relative Humidity
1 What is relative humidity?
Air, in our normal environment, always holds humidity. The number of water molecules in the air can vary
substantially, e.g. it can be as dry as in a desert or as humid as in the tropics. There is an upper limit for the
amount of humidity which air can hold at a given temperature. Beyond this limit saturation occurs. If for some
reason the humidity level is pushed up to this limit, condensation occurs and fog or water droplets form. Relative
humidity tells you what percentage of this maximum amount of humidity is present in the air. In contrast to relative
humidity, absolute humidity denotes the absolute amount of humidity in the air regardless of the saturation level
expressed as the total mass of water molecules per air volume.
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