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# Velocity of Sound in Air

## Velocity of sound in air at temperatures from -40 to 1000oC (-40 to 1500oF) at standard atmospheric pressure - Imperial and SI Units

Speed of Sound in Air at Standard Atmospheric Pressure - Imperial (BG) Units:

Temperature
- t -
(oF)
Speed of Sound
- c -
(ft/s)
-40 1004
-20 1028
0 1051
10 1062
20 1074
30 1085
40 1096
50 1106
60 1117
70 1128
80 1138
90 1149
100 1159
120 1180
140 1200
160 1220
180 1239
200 1258
300 1348
400 1431
500 1509
750 1685
1000 1839
1500 2114

Speed of Sound in Air at Standard Atmospheric Pressure - SI Units:

Temperature
- t -
(oC)
Speed of Sound
- c -
(m/s)
-40 306.2
0 331.4
5 334.4
10 337.4
15 340.4
20 343.3
25 346.3
30 349.1
40 354.7
50 360.3
60 365.7
70 371.2
80 376.6
90 381.7
100 386.9
200 434.5
300 476.3
400 514.1
500 548.8
1000 694.8

### Speed of Sound in Air and Relative Humidity

For full table - rotate the screen!

Temperature
(°C)

Speed of Sound (m/s)
Relative Humidity (%)
102030405060708090
0 331.5 331.5 331.5 331.6 331.6 331.6 331.7 331.7 331.7
5 334.5 334.6 334.6 334.7 334.7 334.7 334.8 334.8 334.9
10 337.5 337.6 337.7 337.7 337.8 337.9 337.9 338.0 338.0
15 340.5 340.6 340.7 340.8 340.9 341.0 341.1 341.2 341.2
20 343.5 343.6 343.7 343.9 344.0 344.1 344.2 344.4 344.5
25 346.4 346.6 346.8 347.0 347.1 347.3 347.5 347.6 347.8
30 349.4 349.6 349.9 350.1 350.3 350.5 350.8 351.0 351.2

### Calculate Velocity of Sound in Air

The velocity of sound can be calculated in metric units as

vms = 20.05 (273.16 + tC)1/2                       (1)

where

vms = velocity of sound (m/s)

tC = temperature (°C)

Velocity of sound in Imperial units:

vfts = 49.03 (459.7 + tF)1/2                       (2)

where

vfts = velocity of sound (ft/s)

tF = temperature (°F)

## Related Topics

• Gases and Compressed Air - Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves
• Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more
• Acoustics - Room acoustics and acoustic properties - decibel A, B and C - Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation

## Tag Search

• en: speed sound air humidity temperature atmosphere pressure
• es: velocidad de la humedad del aire sonido ambiente de temperatura presión
• de: Geschwindigkeit Schallluftfeuchte Temperaturatmosphäre Druck

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## Citation

• Engineering ToolBox, (2003). Velocity of Sound in Air. [online] Available at: https://www.engineeringtoolbox.com/air-speed-sound-d_603.html [Accessed Day Mo. Year].

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