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www.npl.co.uk/.../q-a/atmospheric-altitude-pressure-changes

Pressure at the top of a mountain... Atmospheric pressure reduces with altitude for two reasons, both of which are related to gravity. The gravitational attraction* between the earth and air molecules is greater for those molecules nearer to earth than those further away — they have more weight — dragging them closer together and increasing the pressure (force per unit area) between them.

socratic.org/questions/how-does-atmospheric-pressure...

Atmospheric pressure decreases as altitude increases. You can think of atmospheric pressure in the same way you would think of ocean pressure: the deeper you dive, the greater the pressure because more water is pushing down on you. At sea level, you have the weight of all the air above pushing down on you. Thus as you increase your altitude, the air gets thinner and there is less air pushing ...

www.reference.com/science/air-pressure-change-altitude-e73...

Why Does the Air Pressure Change With Altitude? 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.

scied.ucar.edu/.../change-atmosphere-altitude

Change in the Atmosphere with Altitude. Air pressure changes with altitude. Air is all around us, but we cannot see it. Gravity from the Earth pulls air down - this is called air pressure. We don't feel this pressure because our bodies push an equal amount of pressure outward. This graph shows how air density and air pressure changes with ...

www.answers.com/Q/Why_does_the_gas_pressure_change_with...

Gas pressure changes with altitude because the air around the earth is also a gaseous mixture composed of molecules of oxygen, carbon dioxide,. ... Why does atmospheric pressure change as you go ...

www.windows2universe.org/earth/Atmosphere/pressure_vs...

How Pressure Changes with Altitude in Earth's Atmosphere Air gets 'thinner' with increasing altitude. That's why mountain climbers sometimes need bottled oxygen to breathe, and why it is so easy to get 'winded' while hiking in high mountains or even visiting someplace at elevation.

www.reference.com/science/temperature-change-altitude-2c0b...

A higher density of air molecules implies higher air pressure. According to Gay-Lussac's law, the pressure of gases is directly proportional to the temperature of the gases for a constant volume. Higher pressure at a lower altitude therefore implies higher temperature. When the air pressure decreases with altitude, so does the temperature.

www.quora.com/How-does-atmospheric-pressure-change-with-a...

The atmospheric pressure at sea level will decrease by an infinitesimal amount as the sea level rises. A device called a barometer is used to measure atmospheric pressure. The pressure is caused by the weight of the air above the barometer at sea level. Imagine that the sea level rose by some significant amount.

ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/prs/hght.rxml

Pressure with Height pressure decreases with increasing altitude The pressure at any level in the atmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels.

www.quora.com/Why-does-atmospheric-pressure-always...

Q: Why does atmospheric pressure always decrease with altitude? Because in a gas, temperature is the average speed of the molecules, and pressure is how closely they are packed. In a vacuum, all molecules will eventually fly off into the void, but in a gravity field, molecules higher up in the atmosphere bump until those below them.