The speed of sound in air depends on the temperature of air, and - TopicsExpress

The speed of sound in air depends on the temperature of air, and the composition of the air (different amounts of gases or water vapor present ). At 0 degrees Celsius (freezing point), the speed of sound in regular dry atmospheric air is 331.4 meters/second (or 742 miles per hour). At 22 degrees Celsius (71 degrees F), the speed of sound is 344 m/s (772 mph). At 100 degrees C (boiling point), the speed of sound is 392 m/s (878 mph). You can use the link to calculate the speed of sound for any temperature.

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