Properties of Phosphine (PH3)
Phosphine is a chemical compound with the formula PH3. It is a colorless, flammable, and highly toxic gas with a pungent odor. It is used in various industrial applications, such as in the semiconductor industry and as a fumigant for stored grain.
The following table provides a comprehensive list of phosphine properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Molar Mass | 33.998 g/mol |
| Density (25°C) | 1.379 kg/m3 |
| Dynamic Viscosity (25°C) | 10.6 µPa·s |
| Thermal Properties | Metric |
| Melting Point | -133.8 °C |
| Boiling Point | -87.8 °C |
| Thermal Conductivity (25°C) | 0.016 W/m·K |
| Specific Heat Capacity (Cp) | 1091 J/kg·K |
| Critical Constants | Metric |
| Critical Temperature (Tc) | 51.5 °C |
| Critical Pressure (Pc) | 6.53 MPa |
| Critical Density (ρc) | 300 kg/m3 |
| Hazardous Data | Metric |
| Autoignition Temperature | 80 °C |
| Lower Flammability Limit | 1.6% |
| Upper Flammability Limit | 98% |
| NFPA Rating (Health) | 4 |
| NFPA Rating (Fire) | 4 |
| NFPA Rating (Reactivity) | 2 |
Unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)
Related Pages
References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017. 3) Yaws, Carl L. The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals. Netherlands: Elsevier Science, 2015. 4) Fire Protection Guide to Hazardous Materials, 14th Edition. United States: National Fire Protection Association, 2010.