relative humidity
"Absolute humidity, on the other hand, refers to the actual amount of water vapor in the air regardless of saturation. Relative humidity is like a cars gas gauge, Shaman notes. It tells you how full your tank is. Absolute humidity represents how many gallons you have in your tank, regardless of the tank's size."
"Relative humidity is the ratio of the actual vapor pressure to the saturated vapor pressure, which we discussed in detail in Episode 3 of this series. So relative humidity is like a measure of how saturated the air is"
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