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.Continue Reading
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
Atmospheric pressure decreases as altitude increases. High altitudes contain less air molecules, resulting in lower air density, decreased temperatures and lower air pressure. High altitudes are typically found above sea level.Full Answer >
Air cools when it rises through the atmosphere because as altitude increases, air pressure decreases and allows the individual air molecules to expand away from each other. This expansion leads to a decrease in collisions between air molecules, which then results in less heat energy being transferred between those molecules.Full Answer >
When altitude increases, air temperature decreases. This is because, with an increase in altitude, there is a decrease in air pressure. When air pressure decreases, air cools down.Full Answer >
The atmosphere becomes less dense as altitude increases because there is less weight on the air molecules, making them less compressed. The air at lower altitudes is denser because it is pressed down by the weight of all the air molecules above. Also, the further away air molecules are from the Earth, the less weight they have because of a lower gravitational pull.Full Answer >