The speed of sound in air at room temperature (20 °C or 68 °F) is approximately 343 meters per second (about 1,125 feet per second; 1,235 kilometers per hour; 767 miles per hour). This speed can change based on the temperature and the medium through which sound travels. For example, sound travels faster in liquids and solids than in gases. In seawater, sound travels at about 1,500 meters per second, and in solids like metal or diamond, it can be even faster. The speed also depends on other factors such as the type of gas and its composition. Sound cannot travel in a vacuum since it requires a medium to propagate.
