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Spacecraft Maximum Allowable Concentrations for Selected Airborne Contaminants Volume 1 (1994) / Chapter Skim
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B6: Hydrogen
Pages 139-142

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From page 139...
... . Formula: H2 CAS number: 1333-74-0 Molecular weight: 2.0 Boiling point: -252.~°C Melting point: -259.2°C Gas density: 0.069 that of air Conversion factors at 25°C, ~ atm: ~ ppm = 0.082 mg/m Img/m3=12.2ppm OCCURRENCE AND USE 13 Hydrogen is present in fuel cells as a by-product of oxygen generation from water.
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From page 140...
... The American Conference of Governmental Industrial Hygienists classifies hydrogen as a simple asphyxiant with no exposure limit set (TLV Committee, 1990~. TABLE 6-1 Spacecraft Maximum Allowable Concentrations Durations ppm mg/m3 Target Toxicity 1 h 4100 336 None (explosivity)
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From page 141...
... A safety factor of 10 agrees with the recommendation of He U.S. Environmental Protection Agency that personnel doing environmental monitoring should!
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Key Terms

  • oxygen concentration
  • explosive limit
  • simple asphyxiants
  • industrial hygienists
  • allowable concentrations

  • johnson space
  • spacecraft maximum
  • maximum allowable
  • tlv committee
  • governmental industrial

  • space center
  • american conference
  • exposure limit
  • chemical substances
  • remedial response

  • response team
  • explosive gas
  • medical toxicology
  • personnel doing
  • bacterial degradation

  • include tachypnea
  • gas reaches
  • biological source
  • environmental response
  • toxic effects

  • acceptable levels
  • preliminary date
  • hygienists classifies
  • simple asphyxiant
  • basic nutritional


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