nonane is just an alkane (no double bonds) like methane or propane
the word nonane comes from the fact that it has 9 carbon atoms the convention is
1 carbon = meth
2 carbon = eth
3 carbon = prop
4 carbon = bute
5 carbon = pent
6 carbon = hex
7 carbon = hept
8 carbon = oct
9 carbon = non
(these are prefixes)
and the fact that it has no double or tripple bonds makes in an alkane and the suffex for an alkane is -ane, an alkene (double bond) = ene and an alkyne (trippel bond) has the suffex -yne
the number of hydrogen atoms comes from the fact every carbon must make 4 bonds so they are there to make up the bonds that are not used for other atoms such as carbon, oxygen, nitrogen ect
this convention meens you can draw a molecule just from the name
edit: these molecules are just chains, whith no branches, that would complicate the name a bit. im not so sure why you would have a gas sensore for that, its a liquid at room temp, it has a boiling point much high than that of water (it boils at about 150c) so its no very volatile, strange
( however it does have a flash point of 31C)