Air Density Calculator

Calculate the density of air based on pressure, temperature, and humidity

Input Parameters

Calculation Results

Calculation Formula

ρ = (P * M) / (R * T)

Where:
ρ = density (kg/m³)
P = absolute pressure (Pa)
M = molar mass of dry air (28.97 g/mol)
R = specific gas constant for dry air (287 J/(kg·K))
T = absolute temperature (K)

Result

Air Density: -- kg/m³

Density of Dry Air: -- kg/m³

Density of Moist Air: -- kg/m³

Air Density Calculator Calculator Usage Guide

Learn how to use the Air Density Calculator and understand the factors affecting air density

How to Use This Calculator

  1. Enter the absolute pressure of the air in Pascals (Pa). Standard sea level pressure is approximately 101,325 Pa.
  2. Enter the temperature of the air in degrees Celsius (°C). Remember to convert from Fahrenheit if needed.
  3. Enter the relative humidity of the air as a percentage (%). If you don't know this value, you can estimate it or leave it at 0 for dry air calculations.
  4. Click the "Calculate" button to compute the air density.

Understanding Air Density

Air density is the mass of air per unit volume. It's an important parameter in many fields including meteorology, aviation, and HVAC engineering.

The density of air depends primarily on three factors:

  • Temperature: As temperature increases, air density decreases.
  • Pressure: As pressure increases, air density increases.
  • Humidity: As humidity increases, air density slightly decreases because water vapor is less dense than dry air.

Applications of Air Density Calculation

Air density calculations are essential in:

  • Aviation - for calculating aircraft performance
  • Weather forecasting - for understanding atmospheric conditions
  • HVAC system design - for proper airflow and ventilation
  • Compressed air systems - for determining storage capacity and flow rates
  • Industrial processes - where precise gas measurements are needed

Note: This calculator uses the ideal gas law with humidity corrections for relatively small humidity values. For extremely high humidity or precision requirements, more complex models may be needed.