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Hydrogen Structure


Chemical Properties

Melting point −259.2 °C(lit.)
Boiling point −252.8 °C(lit.)
Density  0.0899
vapor density  0.07 (21 °C, vs air)
vapor pressure  Critical temperature is - 239.9 °C; noncondensible above this temperature
Flash point <-150°C
pka 35(at 25℃)
form  colorless gas
Odor Odorless gas
explosive limit 74.2%
Water Solubility  0.00017 g/100 mL
Merck  13,4813
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.
CAS DataBase Reference 1333-74-0(CAS DataBase Reference)
NIST Chemistry Reference Hydrogen(1333-74-0)
EPA Substance Registry System Hydrogen (1333-74-0)


Signal wordDanger
Hazard statements H220-H280
Precautionary statements P210-P377-P381-P410+P403
Hazard Codes  F+
Risk Statements  12
Safety Statements  9-16-33
RIDADR  UN 1950 2.1
WGK Germany  -
RTECS  MW8900000
Autoignition Temperature 500 to 590 °C
DOT Classification 2.1 (Flammable gas)
HazardClass  2.1
Hazardous Substances Data 1333-74-0(Hazardous Substances Data)
Toxicity TLV-TWA (ACGIH) None established; simple asphyxiant
NFPA 704:
3 0

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