From MarineBiotech Infopages
Definition of In situ:
In its original place. From the Latin word situs meaning place. In oceanography, this term is mostly used with instruments that measure properties directly in the sea: in situ measurement, in situ sensor, and in situ instrument. The term used to describe the temperature that a water volume has at the specific depth the instrument is located is known as in situ temperature.
This is the common definition for In situ, other definitions can be discussed in the article
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