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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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Q: What is the description for 90 percent humidity?
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If the relative humidity is 90 percent does that mean there is only 10 percent of air left?

No, relative humidity refers to the amount of water vapor in the air compared to the maximum amount it can hold at that temperature. A relative humidity of 90% means the air is holding 90% of the maximum water vapor it can hold at that temperature, not that only 10% of the air is left.


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