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Notice: The speed of sound changes with temperature and

a little bit with humidity − but not with air pressure (atmospheric pressure).

The words "sound pressure at sea level" are incorrect and misleading.

The temperature indication, however, is absolutely necessary. The speed of sound in air at 20 degrees Celsius (68 degrees Fahrenheit) is 343 metres per second. That is 1126.547 feet per second.

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βˆ™ 14y ago
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βˆ™ 10y ago

The three variables that influence the speed of sound are the

temperature, density, viscosity, and elasticity of the medium.

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βˆ™ 14y ago

Temperature, pressure, and humidity.

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Q: What are three factors or variables that affect the speed of sound?
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