Question

Why does the density of air decrease with the increase in height

Answer 1

density of air decreases with height. There are two reasons: at higher altitudes, there is less air pushing down from above, and gravity is weaker farther from Earth's center. So at higher altitudes, air molecules can spread out more, and air density decreases .

Answer 2

I think the air density decrease as due to gravity as the hot air raises up it momentarily increased the density at height (like in up troposphere) and then the temperature plays role between them..... Because the temperature decrease with altitude should have made the particles come closer and hence overall density increase..on this it could be that the coming closer of particles make rain also.