Because hydrogen is such a small molecule, leaks are common.

  • Gaseous hydrogen leaks are impossible to detect by human senses since hydrogen is colorless, odorless, and tasteless.
  • If hydrogen accumulates in a confined space in sufficient concentrations, it is an asphyxiant (like any other gas except oxygen).
  • Liquid hydrogen leaks are characterized by frost or ice crystals near the leak and usually a vapor cloud indicating moisture condensation from the surrounding air.
  • In the event of a cryogenic spill, immediately evacuate the area and notify the authorities.
  • Hydrogen Leak Detection
    • Listen for high-pressure gas leaking (loud hissing sound).
    • Use portable hydrogen detectors.
    • Gas detectors may be installed in storage facilities and fueling stations. Listen and watch for audible or visual alarms.