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# Speed of sound

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. Sound moves faster through liquids and solids than air, since liquids and solids can be pushed together more. 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.

You can calculate the speed of sound like this:

[math]a = \sqrt{\gamma*R*T}[/math]

Where: [math]\gamma[/math] is the ratio of specific heats (1.4 for air) R is the gas constant ([math]287 N*m/kg*K[/math] for air) T is temperature (in Kelvins)

The speed of sound is also known as Mach 1.

## Other websites

- Calculate the speed of sound in air and the temperature
- Speed of sound - temperature matters, not air pressure

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