subsonic

Slower than sound

Subsonic means slower than the speed of sound—roughly 767 miles per hour at sea level.

The term applies primarily to aircraft and projectiles: subsonic ammunition, a subsonic cruise speed.

Subsonic also describes sound frequencies below the range of human hearing, typically under 20 hertz, though infrasonic is more precise for that sense.

frequency

infrasound

Sound below 20 Hz

bassDeep pitch or fish
rumbleLow rolling sound
vibrationRapid oscillating movement

hertz · wavelength · oscillation · drone · hum · low-frequency · seismic · earthquake · tremor · pulsation

speed

aircraft

Airborne transportation vehicle

flightAerial journey by aircraft
aviationFlying or operating aircraft
airspeedAircraft's atmospheric velocity

aerodynamics · Mach · velocity · drag · lift · turbulence · wind tunnel · propeller · cruise · glider

ammunition

cartridge

Sealed container for supplies

bulletFired metal projectile
suppressorDevice that inhibits output
silencerSound-dampening gun attachment

firearm · muzzle · velocity · round · rifle · pistol · quiet · stealth · hunting · ballistics

subsonic

infrasound

aircraft

cartridge

subsonic

Opposites

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