ERNST MACH (1838-1916)

1895 – Austria

‘The ratio of the velocity of an object in air to the velocity of sound in air is termed the Mach number’

picture of the BELL X 1 in flight

If the Mach number is 1, speed is called sonic. Below Mach 1 it’s subsonic; above Mach 1 it’s supersonic.

Captain Chuck Yeager was the first person to break the sound barrier, on 14 October 1947. His flight was in the Bell X-1 rocket under an US government research program.

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2 thoughts on “ERNST MACH (1838-1916)

  1. Pingback: DANIEL BERNOULLI (1700- 82) JAMES CLERK MAXWELL (1831- 79) | neilsen

  2. Pingback: EDWIN HUBBLE (1889-1953) | neilsen

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