Hydrogen is originated in the atmosphere at trace levels. Hydrogen is synthesized from hydrocarbons & from water where it constitutes the lightest fraction of the H2O molecule. Hydrogen gas cannot sustain any life.
1) Hydrogen is Colorless 2) Hydrogen is Highly flammable 3) Hydrogen is Light in weight 4) Density: 0.0899*10 -3 g.cm -3 at 20 °C 5) Melting point: - 259.2 °C 6) boiling point: - 252.8 °C 7) Pure hydrogen is a gas under normal conditions. 8) Hydrogen is diatomic & much lighter than air. 9) Hydrogen has such small mass that it can escape earth's gravitational pull and fly off into space. 10) The gas mixes well with air, explosive mixtures are very easily formed. 11) The Hydrogen is gas is lighter than air.
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