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'''Residence time''' is the average time that a [[molecule]] of a substance stays in a given area. Residence time of species X is defined as the ratio of the mass X in the area to its removal rate.<ref name="jacob">Jacob, Daniel J. ''Introduction to Atmospheric Chemistry'' Princeton University: 1999</ref>
'''Residence time''' is the average time that a [[molecule]] of a substance stays in a given area. Residence time of species X is defined as the ratio of the mass X in the area to its removal rate.<ref name="jacob">Jacob, Daniel J. ''Introduction to Atmospheric Chemistry'' Princeton University: 1999</ref>
In [[atmospheric chemistry]], residence time is also called ''lifetime''. It can be used to describe how long [[pollutant]]s stay in the atmosphere. <ref name="jacob" />
In [[atmospheric chemistry]], residence time is also called ''lifetime''. It can be used to describe how long [[pollutant]]s stay in the atmosphere.<ref name="jacob" />
==References==
==References==