दरियाफ्त, जांच-परख (Tracer Meaning in Hindi)
A tracer is a constituent that is transported by a flow. A distinction is often made between active tracers that modify the flow through their influence on density (such as temperature and salinity in the ocean), and passive tracers that do not influence the motion (such as chlorofluorocarbons in the ocean). In oceanography, phytoplankton and zooplankton are generally treated as tracers because their movement is mainly determined by the ocean circulation.
