Which gas is found at the lowest concentrations in the atmosphere?

a. water vapor
b. oxygen
c. hydrogen
d. nitrogen

2007-04-24 07:16:08 · 2 answers · asked by JoAnna 2 in Environment

nitrogen - 78%
oxygen - 20%

hydrogen - <1%

2007-04-24 08:01:14 · answer #1 · answered by Christmas Light Guy 7 · 0⤊ 0⤋

Hydrogen, 0.5 ppm in dry air.

Water vapor concentration is highly variable.

2007-04-24 07:25:46 · answer #2 · answered by JLynes 5 · 1⤊ 0⤋

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