Hydrazine is an inorganic compound with the chemical formula N2H4. It is a simple pnictogen hydride, and is a colourless flammable liquid with an ammonia-like odor.
Hydrazine is highly toxic unless handled in solution as, for example, hydrazine hydrate (NH2NH2·xH2O).
| Appearance | Colorless, fuming, oily liquid |
| Odor | Ammonia-like |
| Density | 1.021 g·cm−3 |
| Melting point | 2 °C; 35 °F; 275 K |
| Boiling point | 114 °C; 237 °F; 387 K |
| Solubility in water | Miscible |
Hydrazine is mainly used as a foaming agent in preparing polymer foams, but applications also include its uses as a precursor to polymerization catalysts, pharmaceuticals, and agrochemicals, as well as a long-term storable propellant for in-space spacecraft propulsion.
Additionally, hydrazine is used in various rocket fuels and to prepare the gas precursors used in air bags. Hydrazine is used within both nuclear and conventional electrical power plant steam cycles as an oxygen scavenger to control concentrations of dissolved oxygen in an effort to reduce corrosion.
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