Anonymous
Anonymous asked in Science & MathematicsWeather · 8 years ago

Does humidity increase or decrease with elevation?

So like, is it usually more or less humid in the mountains compared to not?

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  • 8 years ago
    Favorite Answer

    John Smith gave you the correct answer: the absolute humidity decreases with altitude. Here is an example:

    A cubic meter of moisture saturated air at 15 degrees Celsius cannot contain more than 13 grams of water. If that air rises and cools down by the average adiabatic lapse rate of 0.65 C per 100 meters, when reaching 2,300 meters, the temperature will be 0 C (freezing point).

    But at that temperature, the air is already saturated with only 5 grams per cubic meter. It means that, during that rising, the air must get rid of 13 - 5 = 8 grams of water per cubic meter.

    ... and it does it by condensation and that's how clouds are forming! :-)

    So, the absolute humidity (volume of water per volume of air) decreases with the altitude but the relative humidity (percent of saturation point) stays the same in both cases since the air is still saturated and the relative humidity is 100 percent.

    But if we had done the opposite operation and warmed up a saturated air parcel from 0 to 15 C, the relative humidity would then have dropped to 5 / 13 * 100 = 38 percent and that is relatively dry air.

    And this explains why, during the winter when you get the outside air warmed up inside you home, the relative humidity is very low and, why when you fly an airliner at 30,000 feet above sea level, the air feels very dry.

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  • TQ
    Lv 7
    8 years ago

    Humidity is measured by the difference between the air temperature and the dew point temperature.

    In general...the air becomes drier and cooler with increasing altitude with the air temperature cooling almost five times faster than the dew point. At some point...if there's enough moisture in the air...the two temperatures will converge...the humidity will increase...and a cloud will form. The humidity inside the cloud is 100%. In this case...the humidity does increase with increasing elevation.

    In other cases...in the middle and upper troposphere (> 8000'; 2.5km)...there's very little moisture so the humidity is usually quite low.

    Source(s): Meteorologist.
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  • Anonymous
    4 years ago

    Humidity Altitude

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  • 8 years ago

    The principle to remember is that warm air can hold more water vapour than cold air.

    As you increase elevation, the air gets cooler and less capable of holding water vapour, so generally it is less humid on the top of a mountain.

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  • 5 years ago

    decrease

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  • 4 years ago

    waste

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  • Anonymous
    8 years ago

    idk but your cute

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