What are the characteristics of troposphere and stratosphere?
The atmosphere above troposphere is called stratosphere. The temperature here is extremely low (about 56't2), there is no water vapor, and the temperature does not change with height. This layer is also called the stratosphere. Air has no upward motive force, and can only move horizontally. Apart from the wind, there are no weather phenomena such as clouds, rain, thunder and electricity. Because the plane uses a jet engine and a pressurized cockpit, it can fly in the stratosphere. The stratospheric air is thin and there is no weather change, which greatly reduces the flight resistance of the aircraft and makes it fly quickly and safely. The stratosphere altitude ranges from L 1 km to 80 km, the flying altitude of supersonic passenger aircraft is L3 ~ 18 km, and that of subsonic jet is 7 ~ 13 km. This is the boundary area between troposphere and stratosphere, sometimes called troposphere.