Speed of Sound

The table shows the difference in the speed of sound between air and water, different temperatures and between fresh and salt water. Normally we specify the speed of sound (c) in a medium in meters per second [m/s] or feet per second [ft/s]. In the air, the speed of sound is dependent on the temperature: In the air, at 0° C or 32° F, the speed of sound is 331.4 m/s or 1086 ft/s (1193 km/h or 740.5 mph). In the air, at 20° C or 68° F, the speed of sound is 343.54 m/s or 1126 ft/s (1237 km/h or 767.7 mph).