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Water can "dissolve" in air. As the temperature and pressure of air goes up, the amount of water that can be held in the air increases.

We can measure the "absolute" humidity of air, but this isn't especially useful. It is more handy to know hoe much water is IN the air, as a percentage of the amount of water the air COULD hold.

That's "relative humidity". It is important because as the temperature rises, the air COULD hold more water, so the relative humidity falls. As the temperature falls, the relative humidity rises.

As the air cools, when the air couldn't possibly hold any more water than it has now, the relative humidity is 100%, and we call this the "dew point", when dew will begin to settle onto the grass. If the air gets much colder, the water will condense out of the air and form FOG.

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What does it mean if the relative humidity of air is 50 percent?

If the relative humidity is at 75%, the air is not holding it's maximuim amount of water vapor. If it was holding its maxumum amount it would be 100%. The formula for that is:Actual water vapor_______________ * 100 Equals the percentTotal water vapor


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Climate is a weather pattern that occurs in an area over many years, where as weather is a day to day occurrence which can differ depending on the humidity, relative humidity, precipitation percentages and temperature.


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What does it mean if the relative humidity of air is 50 percent?

If the relative humidity is at 75%, the air is not holding it's maximuim amount of water vapor. If it was holding its maxumum amount it would be 100%. The formula for that is:Actual water vapor_______________ * 100 Equals the percentTotal water vapor


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