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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it’s not that there is 80% gaseous water + 20% atmosphere. It means that air (the mixture of oxygen, nitrogen, etc) can transport a certain amount of moisture. Think of it like a glass if water can take a certain amount of salt withiut you seeing any. 80% means that the current water level in the air is 80% of whats the maximum of water the air can contain at tis temperature. The same amount of water would yield a higher percentage if the air was cooler or a lower percentage, if you heat that air up. This can be seen in condensation: air with a relatively high waterpercentage cools down (eg when in contact with a surface) and isn’t able to hold all of it anymore. The surplus water then gathers in drops you can actually see.
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