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Formula for speed of sound c = 331 + 0.6 × ϑ

ϑ = temperature in degrees celsius.

At ϑ = 20°C we get a speed of sound c = 331 + 0.6 × 20 = 343 m/s.

1 °C change of temperature is equal to 60 cm/s change of speed of sound.

The speed of sound changes clearly with temperature, a little bit with humidity − but not with air pressure (atmospheric pressure).

The words "sound pressure at sea level" are incorrect and misleading in the case of "speed of sound". The temperature indication, however, is absolutely necessary.

The changing of atmospheric pressure does not change the sound of Musical Instruments in a concert hall or in a room.

Look at link: "Temperature Dependence of Physical Entities".

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