Q:

What units are used to measure air pressure?

A:

Quick Answer

Air pressure, the force exerted on a mass by the weight of air particles, is measured in either inches of mercury or in millibars, represented by inHg and mb, respectively. One standard atmosphere, represented by the symbol atm, is equal to 29.92 inHg, or 1013.25 mb.

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Full Answer

High air pressure in excess of 29.92 inHg, or 1013.25 mb, indicates a high concentration of air particles at the surface. In meteorology, high air pressure systems are associated with clear weather conditions. Low air pressure, or air pressure below 29.92 inHg, or 1013.25 mb, indicates the lifting of air particles away from the surface. In meteorology, low air pressure systems are associated with poor weather conditions. For example, in the eye wall of a hurricane, the air pressure can dip to as low as 990 mb.

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Related Questions

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    What measures air pressure?

    A:

    A barometer is a device used to measure air pressure, or atmospheric pressure. The first kind of barometer invented was the mercury barometer. The other type, the aneroid, is a digital barometer.

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  • Q:

    What tool measures air pressure?

    A:

    The barometer is a tool that measures air pressure. Barometers are calibrated for a specific unit, that displays the current air pressure of the environment that the tool is exposed to.

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  • Q:

    Why does the air pressure change with altitude?

    A:

    Air pressure changes with altitude because of issues related to gravity. Molecules have more weight the closer they are to the Earth and more of them move to lower elevations as a result; this causes increased pressure because there are more molecules in number and proximity. Conversely, air at higher elevations has less weight, but also forces pressure on those layers below it, resulting in the molecules closer to the Earth supporting more weight, increasing the pressure.

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  • Q:

    What is the air pressure in the exosphere?

    A:

    The air pressure in the exosphere is extremely low due to its high altitude and the distance between the molecules it contains. The exosphere is the Earth's uppermost atmospheric layer, and it is not highly affected by the Earth's gravitational pull.

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