That is the reason for the rule of thumb where when you see a flash of lightning, count the number of seconds until you hear the thunder clap, then divide by five. See: DOPPLER EFFECT, ECHOLOCATION, SONAR, SONIC BOOM, SUBSONIC, SUPERSONIC, SUPERSONIC TRANSPORT, WAVELENGTH. Speed of sound in air at standard atmospheric pressure with temperatures ranging -40 to 1000oC (-40 to 1500oF) - Imperial and SI Units. The speed of sound in air is around 768 mi/hr (1,125 ft/sec, 343m/sec), or about 5 seconds per mile (3 seconds per kilometer). For each degree Centigrade increase in temperature, the speed of sound increases by 0.61 m/sec or 2.0 ft/sec. Propagation speeds for other media are given in the chart below. At 0° Centigrade and 1.013 x 10 5 Newtons per square meter (normal atmospheric pressure), the speed of sound is 331.5 meters/sec, i.e. In air, for instance, temperature and atmospheric pressure are significant factors. See also: ACOUSTIC IMPEDANCE, PARTICLE VELOCITY, REFRACTION, SOUND PROPAGATION. The speed of sound,c, is the square root of the partial derivative of pressure with respect to the density of the medium (say air) with the entropy, s, held. Temperature - Speed of sound in air at standard atmospheric pressure with temperatures ranging -40 to 1000 o C (-40 to 1500 o F) - Imperial and SI Units. The speed of a SOUND WAVE varies greatly when propagated in different media, the PROPAGATION velocity depending on the elasticity (or compressibility), temperature and density of the medium in question.
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