Speed of Sound | Mechanical waves and sound | Physics | Khan Academy
Speed of Sound - Why does sound travel faster in summer than in winter?
Speed of sound in movies
What is Sound?
The sonic boom problem - Katerina Kaouri
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. At 20 °C (68 °F), the speed of sound is 343 metres per second, or a kilometre in 2.91 s or a mile in 4.69 s.