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You'll seldom see or hear anything like "percent humidity".

To be strictly technical and grammatical about it, "ninety percent humidity"

would mean that nine tenths of the air you're breathing is water.

What we're really dealing with, whether or not it's correctly stated, is relative humidity.

That means some fraction of the water vapor that it's able to hold.

"90% relative humidity" means 90% of the amount of water vapor that the air could hold

at its present temperature.

If you were to take a jar full of air, cover it tightly, and heat it up a little bit ...

(not too much; you don't want it to explode, just to get warm) ... the relative

humidity of the air inside the sealed jar would decrease, because warmer air is

able to hold more moisture, so the amount of moisture it went into the jar with

is a smaller fraction of what it can hold now that it's warmer.

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What is 90 percent humidity?

Ninety percent humidity means that the air contains 90 percent of the maximum amount of moisture it can hold at a given temperature. This high level of humidity can make the air feel warmer and more uncomfortable, as it reduces the body’s ability to cool itself through evaporation of sweat. In such conditions, the likelihood of precipitation increases, and visibility can be affected due to moisture in the air. Overall, 90 percent humidity indicates a very damp environment.


What does it mean to have relative humidity of 90 percent?

A relative humidity of 90 percent means that the air is holding 90 percent of the maximum amount of moisture it can contain at a given temperature. This high level of humidity often makes the air feel muggy or oppressive and can lead to discomfort. It also increases the likelihood of condensation, which can result in dew, fog, or precipitation. In such conditions, sweat may not evaporate effectively, reducing the body's ability to cool itself.


If the relative humidity is 90 percent does that mean there is only 10 percent of air left?

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