Propane

CAS Number: 74-98-6. A colorless, odorless, flammable gas used as
a propellant in aerosol products, as a fuel for cooking (as in
gas grills), and in cigarette lighters. A foul-smelling odorant
is often added when propane is used for fuel purposes. Chemical
formula = C3H8. Molecular weight = 44.1 g/mol.