What is the air temperature outside the plane, if the flight altitude is 7 km, and the temperature

What is the air temperature outside the plane, if the flight altitude is 7 km, and the temperature at the surface of the earth is + 20 degrees?

Since with a change in altitude by 1000 meters, the air temperature decreases by 6 ° C, the temperature difference outside the aircraft and on the surface of the Earth will be:

7 km = 7000 m.

7000/1000 * 6 = 7 * 6 = 42 ° C.

Determine the air temperature outside the plane.

For this, we subtract the previously found temperature difference from the air temperature on the Earth’s surface.

Will be:

20 – 42 = -22 ° C.

Answer:

The air temperature outside the aircraft will be -22 ° С.