The speed of sound at 70oC is 371.333m/s.
Refer to the related link below for a calculator for the speed of sound in air.
Speed of sound in dry air is c ≈ 331 + 0.6 × T. T = Temperature in °C. Speed of sound in air at 20°C is c ≈ 331 + 0.6 × 20 = 343 m/s.
Assuming that the air is dry (0% humidity) then the speed of sound in 31 degree air is 382.46 m/s (approximately) Here is the equation for the speed of sound in bone-dry air in degrees C 331.3+((0.606^-1)*("Temp")) in m/s
359m/s
In dry air at one atmosphere, it is 338.7 metres/second.
The answer to your question is the word "speed".
The speed of sound in MPH is 768 at 20C in dry air.
The speed of sound at sea level is 340.29 miles per second.
Speed of sound in dry air is c ≈ 331 + 0.6 × T. T = Temperature in °C. Speed of sound in air at 20°C is c ≈ 331 + 0.6 × 20 = 343 m/s.
In dry air, at 20°C, the speed of sound is 343 meters/second.
I think you may have mixed your answer up with your question. Sound doesn't have a density, but air density affects the speed of sound. Moist air has a higher mass/density than dry air. Speed of sound is higher due to denser air.
In dry air (68F) the speed of sound is 343 meters per second
Assuming that the air is dry (0% humidity) then the speed of sound in 31 degree air is 382.46 m/s (approximately) Here is the equation for the speed of sound in bone-dry air in degrees C 331.3+((0.606^-1)*("Temp")) in m/s
The speed of sound through dry air is 767 miles per hour.
359m/s
Speed of sound in air is c ≈ 331 + 0.6 × T. T = Temperature. Speed of sound in air at 7 °C is c ≈ 331 + 0.6 × 7 = 335.2 m/s.
In dry air at one atmosphere, it is 338.7 metres/second.
The answer to your question is the word "speed".