How fast is the speed of sound at an elevation of 20000 feet?

Answer 1

Forget the altitude. Care about the temperature!

The speed of sound is dependent on the temperature and not on the air pressure of the altitude. At 20 degrees celsius or 68 degrees Fahrenheit the speed of sound is 343 m/s or 1236.3 km/h or 1126.7 ft/s or 667.1 knots.

Scroll down to related links and look at "Speed of sound - temperature matters, not air pressure".

Here is an easy calculator if you know the temperature. Do not care about the altitude!

Scroll down to related links and look at "Calculation of the Speed of sound in air and the important temperature".

Asume a temperature of -70 degrees Celsius for a height of 44,000 feet.

Answer 2

Forget the height and the air pressure. The speed of sound has only to do with the surrounding temperature. Scroll down to related links and look at "Speed of sound c in air and the important temperature".

Answer 3

The speed of sound depends only on the temperature and never on the height. Scroll down to related links and look at "Speed of sound - temperature matters, not air pressure".

Answer 4

Forget the altitude. Go only for temperature.

Scroll down to related links and look at "Speed of sound - temperature matters, not air pressure".

Answer 5

At an elevation of 20,000 feet, the speed of sound would be approximately 662 mph (1,065 km/h). This speed is dependent on factors such as temperature and air density at that particular altitude.

Answer 6

About 675 MPh, 1,087 k/ph or 587 knots.

Answer 7

345m/s