Input interpretation
sound pressure level in moist air
Input values
source pressure level | 90 dB SPL (decibels sound pressure level) dry bulb temperature | 13 °C (degrees Celsius) relative humidity | 100% air pressure | 1015 mbar (millibars) frequency | 2500 Hz (hertz) directivity factor | spherical distance from sound source | 100 meters
Result
perceived sound level | 37.96 dB SPL (decibels sound pressure level) perceived loudness | 41.4 phons (based on ISO 226: 2003 standard)
Equal loudness contour for 41.4 phons
Equal loudness contour for 41.4 phons
Psychrometric properties
wet bulb temperature | 13 °C (degrees Celsius) dew point temperature | 13 °C (degrees Celsius)
Moist air properties
density | 1.229 kg/m^3 (kilograms per cubic meter) humidity ratio | 0.00936 kg of water/kg of dry air (kilograms of water per kilogram of dry air) speed of sound | 338.1 m/s (meters per second) absorption coefficient | 10.36 dB SPL/km (decibels sound pressure level per kilometer) isobaric heat capacity | 1.014 kJ/(kg K) (kilojoules per kilogram kelvin) isochoric heat capacity | 0.7495 kJ/(kg K) (kilojoules per kilogram kelvin) heat capacity ratio | 1.353 molecular weight | 28.8 g/mol (grams per mole)
Composition fractions
| molar | mass dry air | 98.52% | 99.07% water | 1.482% | 0.9271% nitrogen | 76.96% | 74.87% oxygen | 20.65% | 22.94% argon | 0.9064% | 1.257%