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In SI units with dry air at 20 °C (68 °F), the speed of sound c = 343 m/s.

This also equates to 1235 km/h, 767 mph, or 1125 ft/s. Formula for speed of sound is: c = 331 + 0,6 x °C That gives at a cold temperature of 0 °C a speed of sound c = 331 + 0,6 x 0 = 331 m/s. That gives at a warmer temperature of 20 °C a higher speed of sound c = 331 + 0,6 x 20 = 343 m/s. 1 °C changing of temperature means 60 cm/s changing of speeed of sound.

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