ISO 9613 - 1
Acoustics
Attenuation of sound during propagation outdoors -
Part 1:
Calculation of the absorption of sound by the atmosphere
Air pressure in Pa
(typically 101325)
Air temperature
in degrees Celcius
Relative humidity
in %
Sound frequency
in Hz
Enter data in each box above. Click below for result.
dB per km
Notes:
1] JavaScript Browser such as Netscape v.2 or better required
2] No input form constraint checking - be careful to input correctly
3] Values calculated are from actual input frequencies - whereas the tables in ISO 9613 are preferred 1/3 octave frequencies
4] No guarantee of any kind whatsoever for this software
5] Reference should be made to the Standard for full details including accuracy ranges