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NASA researchers at Glenn Research Center measuring aircraft engine noise in 1967
NASA researchers at Glenn Research Center measuring aircraft engine noise in 1967
HPD fit testing
HPD fit testing
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A drum produces sound via a vibrating membrane.
A drum produces sound via a vibrating membrane.
A 'pressure over time' graph of a 20 ms recording of a clarinet tone demonstrates the two fundamental elements of sound: Pressure and Time.
A 'pressure over time' graph of a 20 ms recording of a clarinet tone demonstrates the two fundamental elements of sound: Pressure and Time.
U.S. Navy F/A-18 approaching the speed of sound. The white halo is formed by condensed water droplets thought to result from a drop in air pressure ar
U.S. Navy F/A-18 approaching the speed of sound. The white halo is formed by condensed water droplets thought to result from a drop in air pressure around the aircraft (see Prandtl–Glauert singularity).