Hexadecane

Hexadecane, or n-hexadecane, is a straight-chain alkane with molecular formula C₁₆H₃₄. It is a colorless liquid used as a reference fuel in measuring diesel ignition quality.

Alkanes: Alkanes are saturated hydrocarbons composed only of carbon and hydrogen, with carbon atoms joined by single bonds. Hexadecane belongs to this family of saturated hydrocarbons.
Boiling point: The boiling point is the temperature at which a liquid’s vapor pressure equals the surrounding pressure. Hexadecane boils at about 287 °C at standard atmospheric pressure.
Diesel fuel: Diesel fuel is a liquid fuel used in compression-ignition engines, typically composed of petroleum-derived hydrocarbons. Hexadecane models one straight-chain component of diesel fuel.
Pentadecane: Pentadecane is a straight-chain alkane with molecular formula C₁₅H₃₂. Removing one carbon from the chain changes volatility and melting behavior.
Hydrocarbons: Hydrocarbons are chemical compounds made exclusively of carbon and hydrogen atoms. Hexadecane is a hydrocarbon with a long carbon skeleton.
Vapor pressure: Vapor pressure is the pressure exerted by a vapor in equilibrium with its condensed phase. Its low volatility at ordinary temperatures reflects its large molecular size.
Cetane rating: A cetane rating expresses a diesel fuel’s ignition quality using a standardized test scale. Hexadecane is the primary reference compound associated with the rating’s ignition-delay benchmark.
Heptadecane: Heptadecane is a straight-chain alkane with molecular formula C₁₇H₃₆. Adding one carbon provides a close homolog for comparing physical properties.
Structural formula: A structural formula shows how atoms in a molecule are connected or arranged. Its condensed formula, CH₃(CH₂)₁₄CH₃, makes the unbranched chain explicit.
Combustion: Combustion is a chemical reaction in which a fuel reacts with an oxidant, commonly releasing heat. Hexadecane burns in oxygen to form carbon dioxide and water when combustion is complete.

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