e/Perfluorocarbon tracer

Information
has gloss	eng: Perfluorocarbon tracers (PFTs) are a range of perfluorocarbons used in tracer applications. They are used by releasing the PFT at a certain point, and determining the concentration of that PFT at another set of points, allowing the flow from the source to the points to be determined.
lexicalization	eng: Perfluorocarbon tracer
instance of	(noun) a gas that contributes to the greenhouse effect by absorbing infrared radiation greenhouse gas, greenhouse emission