Humidity: Water vapor content of air
The warmer the air, the more water vapor it can hold and the slower sweat evaporates
Relative Humidity: Ratio of water vapor in a given volume of air, given in a percentage, 100% is the maximum amount of water vapor the air can hold at a given temperature.
Dew Point: Temperature at which a given parcel of air would reach 100% relative humidity (or holding the maximum capacity of water vapor)
At any temperature lower than the dew point, water vapoor condenses into liquid droplets or into a solid like snow or hail. Precipitation occurs.
^Low pressure systems create precipitation because the warm, moist air rises, expands, and then cools and reaches dew point to form condensation, causing precipitation.
Use charts to determine relative humidity and dew point, along with a dry and wet bulb.
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