Density NTP: Normal Temperature and Pressure
– Temperature: 20°C (293,15 K or 68°F)
– Pressure: 1 atm (101,325 kPa, 101,325 kN/m², 14,7 psia)
Density STP: Standard Temperature and Pressure
– Temperature: 0°C (273,15 K or 32°F)
– Pressure: 1 atm (101,325 kPa, 101,325 kN/m², 14,7 psia)
| Gas | Density NTP (kg/m³) | Density STP (kg/m³) |
|---|---|---|
| Acetylene – ethyne (C2H2) | 1,092 | 1,170 |
| Air | 1,205 | 1,293 |
| Ammonia (NH3) | 0,717 | 0,769 |
| Argon (Ar) | 1,661 | 1,1780) |
| Benzene (C6H6) | 3,486 | 3,486 |
| Blast fumace gas | - | 1,250 |
| Butane (C4H10) | 2,489 | 2,500 |
| Butylene – Butene (C4H8) | 2,504 | 2,504 |
| Carbon dioxide (CO2) | 1,843 | 1,977 |
| Carbon monoxide (CO) | 1,165 | 1,250 |
| Chlorine (Cl2) | 2,994 | 3,210 |
| Coal gas | - | 0,580 |
| Combustion products | - | 1,110 |
| Ethane (C2H6) | 1,264 | - |
| Ethylene (C2H4) | - | 1,260 |
| Fluorine (F2) | 1,574 | 1,700 |
| Helium (He) | 0,1664 | 0,1785 |
| Hydrogen (H2) | 0,0893 | 0,0899 |
| Hydrochloric Acid | - | 1,630 |
| Hydrogen Chloride (HCl) | 1,528 | - |
| Hydrogen Sulfide (H2S) | 1,434 | - |
| Krypton (Kr) | - | 3,740 |
| Methane (CH4) | 0,668 | 0,717 |
| Natural gas | - | 0,7 – 0,9 |
| Neon (Ne) | - | 0,8999 |
| Nitric oxide (NO) | 1,249 | - |
| Nitrogen (N2) | 1,165 | 1,2506 |
| Oxygen (O2) | 1,331 | 1,429 |
| Ozone (O3) | - | 2,14 |
| Propane (C3H8) | 1,882 | - |
| Propene – propylene (C3H6) | 1,748 | - |
| Radon (Rn) | - | 9,730 |
| Sulfur Dioxide (SO2) | 2,279 | 2,926 |
| Toluene (C3H6) | 4,111 | 4,111 |
| Water Vapor, steam (H2O) | 0,804 | 0,804 |
| Xenon (Xe) | - | 5,890 |