Constituent
Name
Ambient air in lab conditions
Family
gas
Class
molecular gas
Compound type
gas
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0 ± 0.001
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Mole fraction Mass fraction State Relevance Comments
N2 Nitrogen molecule 78.08 ± 0.01 0.7554842478176921 ± 0.0003090988024504643 mixed main
O2 Oxygen molecule 20.95 ± 0.01 0.23154606567889655 ± 0.00017560295438836406 mixed main
Ar Argon atom 0.934 ± 0.001 0.012887290081918768 ± 1.7420136764478434e-05 mixed main
Ne Neon atom 1.818e-05 ± 2e-08 1.2671507098868862e-07 ± 1.750158415563443e-10 mixed main
CO2 Carbon dioxide molecule 0.0005 ± 0.0001 7.600402236688815e-06 ± 1.5222166635087892e-06 mixed main increased (breathing) and strongly variable in closed room
H2O Water molecule 0.012 ± 0.007 7.466930418503306e-05 ± 4.357808112547949e-05 mixed main average value at 20°C, 50% humidity. Strongly variable with humidity and T°: 0.024 at saturation @ 20°C
Chemical functions
  Function Number Relevance
ROH 2 main
Chemical bonds
  Bond Number Relevance
NN 1 main
O=O 1 main
=C=O 2 main
OH 2 main
Phase type
gas