Light Ends

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A term used in the petroleum industry to identify products that condense at the top of the distillation tower during the refining process.

In a refinerycrude oil is heated causing vapors to rise up through a tower, where they condense at various levels. Those that condense at the highest point are sometimes referred to by oil people as light ends. 

Propane distilled from crude oil is a light end.

See also Refining process.