From the NASA page you linked to (which would not open at
first due to not send the linked page via html formatting - Thanks for making it
easy for everyone!)
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"Mach Number" was named after the Austrian physicist Ernst Mach. Mach 1 is the speed of sound, which is approximately 760 miles per hour at sea level. An airplane flying less than Mach 1 is travelling at subsonic speeds, faster than Mach 1 would be supersonic speeds and Mach 2 would be twice the speed of sound at sea level. |
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+ More NASA Facts... |
The speed of sound in air varies between 331.45 m/s (1229
km/h) at 0�C and 349.45 m/s (1258 km/h) at 30�C. The figure NASA
gives (1222 km/h) in an attempt to show rounded FFU is less then the actual
figure for 0�C. NASA which is suppose to be metric doesn't do us a
service by reverting to FFU and not supplying us with metric data.
Euric
----- Original Message -----
From: "Nat Hager III" <[EMAIL PROTECTED]>
To: "U.S. Metric Association" <[EMAIL PROTECTED]>
Sent: Sunday, 2004-03-28 12:38
Subject: [USMA:29336] 8,000 km/h record
> aircraft yesterday, at speeds up to 8,000 km/h Mach 7:
>
> http://www.cnn.com/2004/TECH/space/03/28/hypersonic.jet.flight/index.html
>
> The significance is that it used an air-breathing engine called a
> scramjet, which could change the economics of rocket launch
> considerably. NASA has a link to it which will soon be updated, but
> they're probably still recovering from last nights celebrations. <g>
>
> http://www.nasa.gov/missions/research/x43-main.html
>
> Nat
>
>
