| Materialization | Colorless flammable gas or liquid in nature, with a strong unpleasant ammonia odor at high concentrations or during compression liquefaction, and a foul odor of fish oil at extremely low concentrations.Boiling point 6.9 ℃
 Relative density 0.654
 Refractive index 1.347
 Flash point -17.78 ℃
 Soluble in water, soluble in ethanol and ether.
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