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The speed of sound is 1,235 kilometres (767 mi) per hour or 330 metres (1,083 ft) per second in dry air in room temperature. It travels at 1500 meters per second through water. Sound moves faster through liquids and solids than air, since they have a larger specific modulus, meaning they are stiffer. Sound cannot travel through a vacuum, which is a space without any air or matter. The speed of sound is affected by temperature. It travels slower at low temperatures, for example in the stratosphere.