What does pentane mean?
Pentane is a colorless, highly volatile hydrocarbon and the simplest liquid member of the alkane series. Its molecules contain five carbon atoms and twelve hydrogen atoms, giving the molecular formula C₅H₁₂. In most technical contexts, “pentane” refers specifically to n-pentane, the straight-chain form, although two branched isomers, commonly called isopentane and neopentane, have the same formula. Pentane is used as a nonpolar solvent in laboratories and industry, and it occurs in petroleum and natural-gas liquids. It is also associated with fuel and with testing or studying volatility because it evaporates readily and forms an easily detected vapour. The word comes from the Greek pente, meaning “five,” reflecting the five-carbon composition that defines the compound and distinguishes it from related alkanes such as butane and hexane.
nounPentane is a colorless, volatile alkane with the molecular formula C₅H₁₂. The name usually refers to straight-chain n-pentane, one of the three structural isomers of this molecular formula.
- A straight-chain hydrocarbon with the molecular formula C₅H₁₂, especially the colorless liquid compound known as n-pentane.
- A member of the pentane isomer group, which also includes branched-chain isomers such as isopentane and neopentane.
"The laboratory heated pentane under reflux before collecting the distillate."
"Pentane is used as a laboratory solvent and as a component of some fuel mixtures."
"The chromatographic separation resolved several pentane isomers from the crude petroleum fraction."
The plural is uncommon in general writing but is used when referring to the compound or to multiple members of the pentane isomer group.
"The researchers compared the boiling points of several pentanes."
Pentane is the simplest commonly encountered liquid alkane: it has only five carbon atoms, yet it is so volatile that its vapour is readily noticeable in the air.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does pentane come from?
The word was formed in the early 19th century from the stem penta-, from Greek pente, meaning “five,” together with the suffix -ane, then used in chemical nomenclature for saturated hydrocarbons. The Greek element also appears in words such as pentagon and pentathlon. The related English word “five” continues the same inherited Indo-European numerical root, although it developed through Germanic rather than Greek.
Related word forms
How pentane is actually used
In technical usage, the unqualified name “pentane” most often means the straight-chain isomer, n-pentane. Because the molecular formula C₅H₁₂ also has branched isomers, the modifier n- or the full name is used when the distinction matters.