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.Know More
In weather, air pressure plays an important part of forecasting. Both high and low pressure affect the conditions when one walks outside.
As air cools and rises in low pressure area, it form condensation and clouds that will culminate in a rain storm; in a high pressure system, the weather is relatively stable.
As air pressure is a constant in weather, news reports include a "high" and "low" pressure indicator. The science has developed an indicator for measuring the density of the air in any given place. Pressure in high is recorded in hectoPascals.
In a high pressure system in the Northern Hemisphere, winds blow clockwise and the air moves toward the Earth. In a low pressure system the air moves in a clockwise direction and rises, causing clouds as it cools.Learn more about Atmosphere
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.Full Answer >
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.Full Answer >
The altitude of the thermosphere stretches between 56 and 621 miles above Earth. The thermosphere is located between layers called mesosphere and exosphere. All three are atmospheric layers of the planet Earth.Full 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.Full Answer >