Tracer

Tracer may refer to:

==Science== Flow tracer, any fluid property used to track fluid motion Fluorescent tracer, a substance such as 2-NBDG containing a fluorophore that is used for tracking purposes Histochemical tracer, a substance used for tracing purposes in histochemistry, the study of the composition of cells and tissues Isotopic tracer, a substance with an isotope that has been enriched to a greater level than that found in nature Radioactive tracer, a substance containing a radioisotope that is used for tracking purposes TRACER (cosmic ray detector) (Transition Radiation Array for Cosmic Energetic Radiation), a balloon-borne cosmic ray detector Tracers, a colloquialism for visual trailing, often experienced in connection with drug use TRACERS (Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites), a pair of orbiters to study the solar wind