Variable
ethylbenzene
n-pentane
2-2-dimethylbutane
isoprene
3-methylpentane
o-xylene
ethyne
propane
ethane
n-butane
n-octane
propene
m-p-xylene
n-heptane
2-methylpentane
2-2-4-trimethylpentane
cyclo-hexane
toluene
n-hexane
ethene
2-methylbutane
1-butene
2-methylpropene
2-2-dimethylpropane
benzene
2-methylhexane