Melting Point −259.2 °C(lit.)
 Boiling Point −252.8 °C(lit.)
 Water Solubility 0.00017 g/100 mL
 Density 0.07 (21 °C, vs air)
 Storage Temp Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
 Flash Point <-150°C
 Stability Stable. Highly flammable. Readily forms explosive mixtures with air. Upper (U.K.) composition limit for use of a nitrogen/hydrogen mixture in the open lab is 5.7% hydrogen.
 Appearance Pale blue colorless gas
 Refractive Index 1.98