<P> The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium . In dry air at 0 ° C ( 32 ° F ) , the speed of sound is 331.2 metres per second ( 1,087 ft / s ; 1,192 km / h ; 741 mph ; 644 kn ) . At 20 ° C ( 68 ° F ) , the speed of sound is 343 metres per second ( 1,125 ft / s ; 1,235 km / h ; 767 mph ; 667 kn ) , or a kilometre in 2.91 s or a mile in 4.69 s . </P>
<P> The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium . In dry air at 0 ° C ( 32 ° F ) , the speed of sound is 331.2 metres per second ( 1,087 ft / s ; 1,192 km / h ; 741 mph ; 644 kn ) . At 20 ° C ( 68 ° F ) , the speed of sound is 343 metres per second ( 1,125 ft / s ; 1,235 km / h ; 767 mph ; 667 kn ) , or a kilometre in 2.91 s or a mile in 4.69 s . </P>
how fast can sound travel in a second
how fast can sound travel in a second
331.2 metres
331.2 metres