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Physical properties of flamable Gases

Hydrogen - Specific Gravity - 0.0694 - Air
1.0 It is much much lighter than air. The small size of the molecule
makes containing of hydrogen more dificult than larger gasious
molecules it also has a limit of flamability in air of 4% to 72 % .

Acetylene - Specific Gravity - 0.907 - Air 1.0

  • It is lighter than air. It will burn with oxygen in the air in
    a great range of mixtures This makes the storing and handeling of
    acetylene dangerous if a leak developes. The limit of flamibility in
    air is from 2.5% to 80.0%

Propane - Specific Gravity - 1.53 - Air .0

  • It is much heavier than air. It is much heavier and collect in
    low laying places and will also burn in the air in a large range of
    mixtures ( although not in as large a range as acetylene ) For this
    reason it is also considered dangerous ( Propane will asphixate people
    and animals in low lying areas as well ) The Limit of flamibility in
    air is from 2.12% to 9.35%

Oxygen - Specific Gravity - 1.105 - Air 1.0 -
It is heavier than air. It is a violent oxidizer and will explode
when petrochemicals ( oil & grease ) are in contact with pressurized

Modern Welding - by Althouse, Turnquist & Bowditch -
Copyright - 1970 - A part of my permanant library

C R C Handbook of Chemistry and Physics - 46th edition -
1965 - 1966 added later. ROBB / ROBOBB - Retired Old Burned Out
Baby Boomer <Big Smile