Why doesn't air from the troposphere and the stratosphere mix freely?

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1.Air Temperature

2.Air Density

3.Air Pressure

4.UV High energy light

1.Cooler, Denser air & Hotter, less dense air.

-Troposphere is less hot than stratosphere.

Colder air stays below.

Hotter air stays above.

2.Cooler, Denser air & Hotter, less dense air.

-Cooler air is denser.

Dense things are heavy.

Heavy things stay below.

Visa-versa.

3.Air pressure and the density of the air also decrease with altitude.

-Temperature is directly proportional to pressure

If air pressure increases, the temperature must increase. 

If air pressure decreases, the temperature decreases.

Up above @stratosphere pressure is less.

Less pressure; less temperature.

Less temperature; colder air.

Because of no air turning over, Stratosphere is still hotter than Troposphere even if its pressure is low.

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4.Why does temperature increase with altitude in the stratosphere?

-In the stratosphere, temperature generally increases as altitude increases due to the increasing absorption of ultraviolet radiation by the ozone layer.

Why Troposphere air is cooler than Stratosphere?

• Troposhere is lowest layer.
•  It's part of the biosphere.
• Warm air at the surface rises and colder, denser air at altitude descends to take its place.
• The air in troposhere is well mixed.
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Why does air temperature increase with pressure?

The energy added as work during the compression of a gas leads to an increase in pressure and temperature.