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Määritelmät

Adjektiivit

1. (of a sound) having a frequency too low to be audible
2. (of a speed) less than the speed of sound (in the same medium, and at the same temperature and pressure)
3. (fluid mechanics, of a flow) with a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources).