Input interpretation
absorption of sound in moist air
Input values
dry bulb temperature | 20 °C (degrees Celsius) air pressure | 1 bar relative humidity | 50% frequency | 5000 Hz (hertz)
Result
absorption coefficient | 44.18 dB SPL/km (decibels sound pressure level per kilometer) | = 71.1 dB SPL/mi (decibels sound pressure level per mile) (from ISO 9613-1: 1993 Acoustics-Attenuation of sound during propagation outdoors)
Psychrometric properties
wet bulb temperature | 13.7 °C (degrees Celsius) dew point temperature | 9.27 °C (degrees Celsius)
Absorption coefficient versus frequency and relative humidity
Absorption coefficient versus frequency and relative humidity
Thermodynamic properties
sound speed | 342.4 m/s (meters per second) density | 1.184 kg/m^3 (kilograms per cubic meter) humidity ratio | 0.00739 kg of water/kg of dry air (kilograms of water per kilogram of dry air) isobaric heat capacity | 1.013 kJ/(kg K) (kilojoules per kilogram kelvin) isochoric heat capacity | 0.7429 kJ/(kg K) (kilojoules per kilogram kelvin) heat capacity ratio | 1.363 molecular weight | 28.84 g/mol (grams per mole)
Composition fractions
| molar | mass dry air | 98.83% | 99.27% water | 1.174% | 0.7338% nitrogen | 77.2% | 75.02% oxygen | 20.71% | 22.99% argon | 0.9092% | 1.26%