The speed of sound wave varies with the temperature of air. It is a measure of distance of sound waves travelled per unit time as it propagates through an elastic medium. Speed of sound is the speed of sound waves travelling in air. The rate at which the sound waves travels varies from one medium to another medium. On earth, speed of light at sea level is 761.2 mph. Gvien here is a speed of sound calculator to find the Speed of Sound Wave by entering the Ratio of specific heats, pressure and density.