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The speed of sound in air 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.
At the temperature ϑ = 20°C the speed of sound is c = 331.3 + 0.606 × 20 = 343.42 m/s.Often the easy calculation will do: c ≈ 331 + (0.6 × ϑ) = 343 m/s.

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