Enter the air pressure, water vapor pressure, and air temperature into the air density calculator. The calculator will display the current air density at those conditions.
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Air Density Formula
The following formula is used to calculate air density.
ρ = (pd / (Rd * T)) + (pv / (Rv * T))
- pd is the pressure of dry air in Pa,
- pv is the water vapor pressure in Pa,
- T is the air temperature in Kelvins,
- Rd is the specific gas constant for dry air equal to 287.058 J/(kg·K), and
- Rv is the specific gas constant for water vapor equal to 461.495 J/(kg·K).
Air Density Definition
Air density is the density of air in any specific temperature and pressure.
How to calculate air density?
- 1.First, determine the pressure of dry air
- This can be calculated using a formula or using a table for air pressure at certain temperatures.
- 2.Next, determine the water vapor pressure
- This is dependent on the relative humidity.
- 3.Measure the air temperature
- Measure the air temperature and convert it to Kelvin.
- 4.Calculate the air density
- Calculate the air density using the formula above.
What is air density?
Air density is the total mass of air within a given volume.
How can air density change?
Air density can change with temperature and pressure. Increasing pressure and temperature both increase density because they are forcing more air into a smaller volume.