Any one of several isometric hydrocarbons, C7H16, of the paraffin series (nine are possible, four are known); -- so called because the molecule has seven carbon atoms. Specifically, a colorless liquid, found as a constituent of petroleum, in the tar oil of cannel coal, etc.

A highly volatile, flammable solvent used as a principal ingredient in rubber cement. Although somewhat less toxic than hexane (see below), heptane shares hexane's ability to cause nerve damage (James, 1985).*Flammable. Neurotoxic. Used in some shoe products.

An alkane having the formula C7H16, flash point of 25°F and explosive limits of 1.2% to 6.7%.