What is the true speed of mach 1 ? 600 and what?

Question

What is the true speed of mach 1 ? 600 and what?

Answer 1

It varies depending on altitude, temperature, humidity and other atmospheric variables, but at sea level under nominal conditions, the speed of sound is approximately 761.1 mph, or 1,100 ft/ second...

Answer 2

it depends on the air temp and at the altitude that you are flying at

Answer 3

The true speed of mach 1 varies with temperature. In dry air at 21C (70 F) the speed of sound is 1130 feet per second, or 770 miles per hour. At -70 F, the speed of sound is 660 mph.

Regards,

Dan

Answer 4

In dry air with a temperature of 21 °C (70 °F) the speed of sound is 770 mph. Wikipedia

Answer 5

all depends upon the air being flown in.  I've seen calculators before on the internet that will show you what it will be given whatever conditions you specify