If it’s 80% humidity outside you may assume it’s quite damp, but what does the 80% translate to in numbers? I cant imagine 80% of the air to be moisture since it’s mostly nitrogen. And how is it calculated/measured?
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Realative humidity is tricky and this is a great question. Humidity is defined as the amount of water in the air divided by the maximum amount of water that could be in the air.
The place that gets tricky is the last part. The amount of water that can be held in the air is a function of temperature. The warmer the air the more water that can be held in suspension.
This is also related to dew, which is what happens when the capacity for water holding decreases as the air gets cooler and the water drops out of suspension and ends up on the ground.
The same process can produce fog.
https://www.edinformatics.com/math_science/what-is-humidity.html
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