Constituent
Name
CH4 gas 99.995%
Family
gas
Class
molecular gas
Compound type
gas
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0 ± 0.001
Chemical composition
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Mole fraction Mass fraction State Relevance Comments
CH4 Methane molecule 0.999975 ± 2.5e-05 0.999963674472777 ± 7.30480651074368e-05 pure main stated purity: > 99.995% - natural istopic composition, but possible fractionation
C2H6 Ethane molecule 7.5e-06 ± 7.5e-06 1.4057345248812e-05 ± 1.40580207055683e-05 mixed impurity maximum impurity in CH4 gas bottle
CnHm Hydrocarbons molecule 2.5e-06 ± 2.5e-06 mixed impurity maximum CnHm impurity in CH4 gas bottle
H2O Water molecule 2.5e-06 ± 2.5e-06 2.80739965970211e-06 ± 2.8075345555188e-06 mixed impurity maximum impurity in CH4 gas bottle
O2 Oxygen molecule 2.5e-06 ± 2.5e-06 4.98651079348261e-06 ± 4.98675039579346e-06 mixed impurity maximum impurity in CH4 gas bottle
CO2 Carbon dioxide molecule 5e-07 ± 5e-07 1.37163940459418e-06 ± 1.37170531199609e-06 mixed impurity maximum impurity in CH4 gas bottle
H2 Hydrogen molecule 5e-08 ± 5e-08 6.28286521892428e-09 ± 6.28316711118674e-09 mixed impurity maximum impurity in CH4 gas bottle
N2 Nitrogen molecule 7.5e-06 ± 7.5e-06 1.30963492514293e-05 ± 1.30969785322379e-05 mixed impurity maximum impurity in CH4 gas bottle
Chemical functions
  Function Number Relevance
R−CH3 2 impurity
R−CH3 impurity
R−CH2−R impurity
R=CH2 impurity
R2>CH−R impurity
R=CH−R impurity
R≡CH impurity
R2>C=C<R2 impurity
R−C≡C−R impurity
R−OH 2 impurity
Chemical bonds
  Bond Number Relevance
≥C−H 4 main
≥C−H 6 impurity
≥C−C≤ 1 impurity
≥C−H impurity
⪖ impurity
\equiv C-H impurity
\geq C-C \leq impurity
>C=C< impurity
-C\equiv C- impurity
-O-H 2 impurity
O=O 1 impurity
=C=O 2 impurity
H-H 1 impurity
N\equiv N 1 impurity
Phase type
gas
Texture
gas