Air Density vs Altitude
Standard Atmosphere Reference Table and Graph (kg/m³)
Air Density vs Altitude Table
| Altitude (km) | Density (kg/m³) |
|---|---|
| 0 | 1.225 |
| 5 | 0.736 |
| 10 | 0.413 |
| 20 | 8.89×10-2 |
| 30 | 1.84×10-2 |
| 40 | 3.99×10-3 |
| 50 | 1.03×10-3 |
| 60 | 3.09×10-4 |
| 70 | 8.28×10-5 |
| 80 | 1.85×10-5 |
| 90 | 3.90×10-6 |
| 100 | 9.0×10-7 |
Air Density vs Altitude Graph
About Air Density vs Altitude
Air density decreases with increasing altitude according to the International Standard Atmosphere (ISA). Density is a key property in aerodynamics, fluid mechanics, thermodynamics, and HVAC engineering, influencing airflow, lift, drag, and heat transfer calculations.
At sea level (15°C, 1 atm), dry air has a density of approximately 1.225 kg/m³. As altitude increases, air density drops exponentially, reaching extremely low values in the upper atmosphere.
The table and graph on this page provide a reference of air density as a function of altitude from sea level to 100 km. Engineers, scientists, and educators can use this data for thermodynamic modeling, aerodynamic studies, and atmospheric research.
Combining air density with other atmospheric properties such as temperature, pressure, and specific gas constant allows accurate simulation and modeling of flow systems, propulsion systems, and atmospheric behavior.