What is the air temperature outside the plane, which flies at an altitude of 9000 m, if on the ground

What is the air temperature outside the plane, which flies at an altitude of 9000 m, if on the ground air temperature = + 20 °.

The constant temperature change for every 100 meters of altitude is 0.6 degrees Celsius.

In this case, the ratio of the aircraft’s altitude to a constant value will be:

9000/100 = 90.

The temperature difference will be equal to:

90 * 0.6 = 54 degrees Celsius.

In order to determine the air temperature overboard, subtract the temperature difference from the air temperature above the Earth’s surface.

In this case, we get:

20 – 54 = -34 degrees Celsius.

Answer: The air temperature outside the plane is -34 degrees Celsius.