The atmosphere becomes less dense as altitude increases because there is less weight on the air molecules,making them less compressed. The air at a low altitude is denser because it is pressed down by all of the weight of all the air molecules above it.
Pressure from the weight of the atmosphere above (remember, the atmosphere is made of molecules of gas, which have mass) causes the atmosphere in the lower levels to compress, thus it is more dense than the atmosphere at higher levels, which are under less pressure from above why
because as you go up, there's less gravity and gravity causes things to be dense
I believe it is because there is actually less air as you go higher up. As there is less air, but just as much space, the air is less dense.
because the air mass decreases
lithosphere, hydrosphere, atmosphere (most dense to least dense)
The atmosphere.
Metophere Hydrophere
The atmosphere
Because there is less air above, pushing down.
The atmosphere becomes less dense with altitude. Atmosphere, thin though it is, has weight, and it is the weight of the air above which compresses the air below it, to greater density.
The air at any given layer in the atmosphere is compressed by the weight of the air above it. As you go up, there is less air wieghing down from above, so the surrounding air is less compressed.
The Earth's atmosphere declines with altitude.
less dense
gravity, denser things go down. -earth science student
because the air mass decreases
That depends a bit on how you understand "actually". Earth's atmosphere gets thinner and thinner (less dense) as you go away from Earth; at an altitude of about 100 kilometers, you are in outer space (by definition), but the atmosphere can still make satellites slow down. At an altitude of a few hundred kilometers, even that becomes insignificant.
lithosphere, hydrosphere, atmosphere (most dense to least dense)
of course not titan has a dense atmosphere as well
The exosphere is the least dense part of the earth's atmosphere.
Because of less gravity in high altitude