Air Density Calculator
Free air density calculator using the ideal gas law. Calculate air density for dry or humid air based on temperature, pressure, and humidity.
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Calculate Air Density
Air density is essential for aviation, meteorology, HVAC engineering, and many industrial applications. Our calculator uses the ideal gas law to compute air density from temperature, pressure, and humidity, accounting for both dry and moist air conditions.
What Is Air Density?
Air density (ρ) is the mass per unit volume of Earth's atmosphere. At standard sea level conditions (15°C, 1013.25 hPa), dry air has a density of about 1.225 kg/m³. Density decreases with altitude, increases with pressure, and decreases with temperature.
Ideal Gas Law
ρ = P / (R × T) for dry airWhy Calculate Air Density?
Aviation Performance
Aircraft performance depends on air density - lower density reduces lift and engine power.
HVAC Engineering
Air handling systems require accurate density for proper airflow calculations.
Wind Energy
Wind turbine power output is directly proportional to air density.
How to Use This Calculator
Common Applications
Aviation
Calculate density altitude for takeoff and landing performance.
Meteorology
Weather models use air density for atmospheric calculations.
Sports
Baseball home runs travel farther in lower density air.
Combustion
Engine performance varies with air density affecting fuel-air mixture.
Frequently Asked Questions
Counter-intuitively, humid air is lighter! Water molecules (H₂O, 18 g/mol) are lighter than nitrogen (N₂, 28 g/mol) and oxygen (O₂, 32 g/mol), so adding water vapor decreases air density.