Properties of Hydrazine (N2H4)
Hydrazine is a chemical compound with the formula N2H4. It is a colorless, highly reactive liquid with a strong ammonia-like odor. Hydrazine is often used in various industrial and aerospace applications as a powerful reducing agent, a fuel in rocket propulsion, and as a component in some chemical processes.
The following table provides a comprehensive list of hydrazine 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 | 32.045 g/mol |
| Density | 1008 kg/m3 |
| Dynamic Viscosity | 0.968 mPa·s |
| Surface Tension (25°C) | 66.7 mN/m |
| Thermal Properties | Metric |
| Melting Point | 1.6 °C |
| Boiling Point | 113.6 °C |
| Vapor Pressure | 1.4 kPa |
| Critical Constants | Metric |
| Critical Temperature (Tc) | 380 °C |
| Critical Pressure (Pc) | 14.69 MPa |
| Critical Molar Volume (Vc) | 96 cm3/mol |
| Electrical Properties | Metric |
| Relative Permittivity (εr) (25°C) | 51.7 |
| Optical Properties | Metric |
| Refractive Index (589 nm) (22.3°C) | 1.46979 |
| Hazardous Data | Metric |
| Flash Point | 38 °C |
| Autoignition Temperature | 270 °C |
| Lower Flammability Limit | 2.9% |
| Upper Flammability Limit | 98% |
| NFPA Rating (Health) | 3 |
| NFPA Rating (Fire) | 3 |
| NFPA Rating (Reactivity) | 3 |
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.