Constituent
Name
CH4 gas 99.995%
Family
gas
Class
molecular gas
Compound type
gas
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0 $\pm$ 0.001
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Mole fraction Mass fraction State Relevance Comments
$CH_4$ Methane molecule 0.999975 $\pm$ 2.5e-05 0.999963674472777 $\pm$ 7.30480651074368e-05 pure main stated purity: > 99.995% - natural istopic composition, but possible fractionation
$C_2H_6$ Ethane molecule 7.5e-06 $\pm$ 7.5e-06 1.4057345248812e-05 $\pm$ 1.40580207055683e-05 mixed impurity maximum impurity in CH4 gas bottle
$C_nH_m$ Hydrocarbons molecule 2.5e-06 $\pm$ 2.5e-06 mixed impurity maximum CnHm impurity in CH4 gas bottle
$H_2O$ Water molecule 2.5e-06 $\pm$ 2.5e-06 2.80739965970211e-06 $\pm$ 2.8075345555188e-06 mixed impurity maximum impurity in CH4 gas bottle
$O_2$ Oxygen molecule 2.5e-06 $\pm$ 2.5e-06 4.98651079348261e-06 $\pm$ 4.98675039579346e-06 mixed impurity maximum impurity in CH4 gas bottle
$CO_2$ Carbon dioxide molecule 5e-07 $\pm$ 5e-07 1.37163940459418e-06 $\pm$ 1.37170531199609e-06 mixed impurity maximum impurity in CH4 gas bottle
$H_2$ Hydrogen molecule 5e-08 $\pm$ 5e-08 6.28286521892428e-09 $\pm$ 6.28316711118674e-09 mixed impurity maximum impurity in CH4 gas bottle
$N_2$ Nitrogen molecule 7.5e-06 $\pm$ 7.5e-06 1.30963492514293e-05 $\pm$ 1.30969785322379e-05 mixed impurity maximum impurity in CH4 gas bottle
Chemical functions
  Function Number Relevance
$R-CH_3$ 2 impurity
$R-CH_3$ impurity
$R-CH_2-R$ impurity
$R=CH_2$ impurity
$R_2>CH-R$ impurity
$R=CH-R$ impurity
$R\equiv CH$ impurity
$R_2>C=C<R_2$ impurity
$R-C\equiv C-R$ impurity
$R-OH$ 2 impurity
Chemical bonds
  Bond Number Relevance
$\geq C-H$ 4 main
$\geq C-H$ 6 impurity
$\geq C-C \leq$ 1 impurity
$\geq C-H$ impurity
$\eqslantgtr C-H$ 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