Layers of the Atmosphere. 2009. Pressure is a force that acts over a certain area. Liquids and gases are fluids. Fluids are any material that is able to flow. Fluids exert pressure because of the motion of their particles.
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Liquids and gases are fluids. Fluids are any material that is able to flow. Fluids exert pressure because of the motion of their particles.
Pressure will always move from a high pressure to a low pressure area. The pressure will always try to equalize. You see this when you get a hole in your bicycle tire.Pressure
There is so much air above you that at sea level you have 14.7 lbs/in2 pushing on you.
Gravity causes most of the air to be pulled down to the surface.Air Pressure
Meteorologists (and the NWS) use millibars, an SI unit.Units of Air Pressure
The air at sea level and at 6km has the same 21% oxygen, but at 6km there are fewer molecules, so you take in less oxygen with each breath.Altitude and Density
Convection currents carry the heat upward, so the air cools as it rises.
The air cools by about 6.5°C for every 1-km above the ground.Temperature and the Troposphere
Without greenhouse gases, energy pretty much passes straight through!Temperature and the Mesosphere
But the air is so thin here that it takes special instruments to measure the temperature accurately.
So even though it is very hot (over 1000°C), it would feel cold because there are so few particles to transfer heat to you.Temperature and the Thermosphere