Enter the atmospheric pressure, temperature and relative humidity in the air density calculator and measure the air density of dry and moist air.
The air density calculator immediately calculates the density of air in kg m3 at a positive temperature and stress. now not only this, however the tool additionally calculates the dew factor, air pressure, and water vapor pressure when the air is completely compressed.
You can calculate the air density using the following equation:
ρ = [(Pd / (Rd * T)) + (Pv / (Rv * T))]
Where:
If we set the temperature at 15 °C & pressure at 1013.25 hPa, the air density could be 1.225 kg/(m^3). At sea stage, the atmospheric strain is maximized because of high air stress. therefore the air is denser at sea degree and we are able to parent this out by way of the air density calculator. The density of the air is denoted by means of the Greek letter Rho (ρ) and it is the degree of the mass consistent with unit quantity and that is why we represent the density of air in kg m3 or g/m3.
here, you may find the density of air in lb/ft3.
| Density of air | Pressure | Density of air lb/ft3 |
|---|---|---|
| Density of air at 15 C | 1 Pascal | 0.00000075474 |
| Density of air at 20 C | 1 Pascal | 0.00000074187 |
| Density of air at 22 C | 1 Pascal | 0.00000073684 |
| Density of air at 25 C | 1 Pascal | 0.00000072943 |
| Density of air at 40 C | 1 Pascal | 0.00000069449 |
We can calculate the air-density in various units like \([ \text{lbm/ft}^3 ]\) \([ \text{sl/ft}^3 \cdot 10^{-3} ]\)\([ \text{lbm/gal(US liq)} ]\) \([ \text{kg/m}^3 ]\). Now if you think about how to calculate the density of air in the above-mentioned units then the following table can be of great help. In this table, we have distinguished the specific weight and thermal expansion coefficient at various temperatures.
| Temperature | Pressure | Specific weight | Thermal expansion coefficient | ||||
|---|---|---|---|---|---|---|---|
| [°F] | [lbm/ft3] | [sl/ft3*10-3] | [lbm/gal(US liq)] | [kg/m3] | [lbf/ft3] | [N/m3] | [x10-3 °F-1] |
| -100 | 0.1104 | 3.431 | 0.01476 | 1.768 | 0.1104 | 17.34 | 2.83 |
| -50 | 0.0968 | 3.010 | 0.01295 | 1.551 | 0.0968 | 15.21 | 2.48 |
| -20 | 0.0902 | 2.803 | 0.01206 | 1.445 | 0.0902 | 14.17 | 2.30 |
| 0 | 0.0862 | 2.681 | 0.01153 | 1.382 | 0.0862 | 13.55 | 2.20 |
| 10 | 0.0844 | 2.624 | 0.01128 | 1.352 | 0.0844 | 13.26 | 2.15 |
| 20 | 0.0826 | 2.569 | 0.01105 | 1.324 | 0.0826 | 12.98 | 2.10 |
| 30 | 0.0810 | 2.516 | 0.01082 | 1.297 | 0.0810 | 12.72 | 2.06 |
| 40 | 0.0793 | 2.466 | 0.01061 | 1.271 | 0.0793 | 12.46 | 2.02 |
| 50 | 0.0778 | 2.418 | 0.01040 | 1.246 | 0.0778 | 12.22 | 1.98 |
| 60 | 0.0763 | 2.372 | 0.01020 | 1.222 | 0.0763 | 11.99 | 1.94 |
| 70 | 0.0749 | 2.327 | 0.01001 | 1.199 | 0.0749 | 11.76 | 1.90 |
| 80 | 0.0735 | 2.284 | 0.00982 | 1.177 | 0.0735 | 11.55 | 1.87 |
| 100 | 0.0709 | 2.203 | 0.00948 | 1.135 | 0.0709 | 11.14 | 1.80 |
| 120 | 0.0685 | 2.128 | 0.00915 | 1.097 | 0.0685 | 10.75 | 1.74 |
| 140 | 0.0662 | 2.057 | 0.00885 | 1.060 | 0.0662 | 10.40 | 1.68 |
| 160 | 0.0641 | 1.991 | 0.00856 | 1.026 | 0.0641 | 10.06 | 1.63 |
| 180 | 0.0621 | 1.929 | 0.00830 | 0.994 | 0.0621 | 9.75 | 1.58 |
| 200 | 0.0602 | 1.870 | 0.00804 | 0.964 | 0.060 | 9.45 | 1.53 |
| 250 | 0.0559 | 1.738 | 0.00747 | 0.896 | 0.0559 | 8.78 | 1.41 |
| 300 | 0.0522 | 1.622 | 0.00698 | 0.836 | 0.0522 | 8.20 | 1.30 |
| 400 | 0.0461 | 1.432 | 0.00616 | 0.738 | 0.0461 | 7.24 | 1.16 |
| 500 | 0.0410 | 1.274 | 0.00548 | 0.656 | 0.0410 | 6.43 | 1.05 |
| 700 | 0.0340 | 1.057 | 0.00455 | 0.545 | 0.0340 | 5.35 | 0.88 |
| 1000 | 0.0272 | 0.845 | 0.00363 | 0.4354 | 0.0272 | 4.27 | 0.70 |
| 1400 | 0.0213 | 0.663 | 0.00285 | 0.3416 | 0.0213 | 3.35 | 0.54 |
| 1800 | 0.0176 | 0.546 | 0.00235 | 0.2813 | 0.0176 | 2.76 | 0.45 |
| 2000 | 0.0161 | 0.501 | 0.00216 | 0.2583 | 0.0161 | 2.53 | 0.42 |
| Property | Description | Formula | Example |
|---|---|---|---|
| Air Density | Mass of air per unit volume. | ρ = P / (R × T) | If P = 101.3 kPa, T = 298K, R = 287 J/kg·K, then ρ = 1.184 kg/m³. |
| Pressure | Force exerted by air per unit area. | P = ρ × R × T | If ρ = 1.2 kg/m³, R = 287 J/kg·K, T = 300K, then P = 103.3 kPa. |
| Temperature | Determines air density at given pressure. | T = P / (ρ × R) | If P = 100 kPa, ρ = 1.225 kg/m³, R = 287 J/kg·K, then T = 283.5K. |
| Gas Constant (R) | Specific constant for dry air. | R = P / (ρ × T) | For dry air, R ≈ 287 J/kg·K. |
| Altitude Effect | Density decreases with height. | ρ = ρ₀ × e^(-h/H) | If ρ₀ = 1.225 kg/m³, h = 5000m, H = 8500m, then ρ ≈ 0.736 kg/m³. |
| Humidity Effect | More humidity reduces air density. | ρ_h = ρ_d × (1 - 0.378 × H) | If ρ_d = 1.2 kg/m³, H = 0.5, then ρ_h = 1.14 kg/m³. |
| Density at Sea Level | Standard air density at 0m altitude. | ρ₀ = 1.225 kg/m³ | At 0m altitude, ρ₀ = 1.225 kg/m³. |
| Ideal Gas Law | Relates air properties. | PV = nRT | Used to calculate air properties. |
| Buoyancy | Objects experience force in air. | F_b = ρ × V × g | If ρ = 1.2 kg/m³, V = 0.5m³, g = 9.81m/s², then F_b = 5.89 N. |
| Mach Number | Speed relative to sound. | M = v / a | If v = 340 m/s, a = 343 m/s, then M = 0.99. |
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