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What do you mean by Biochemical Oxygen D...

What do you mean by Biochemical Oxygen Demand (BOD)?

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It may be defined as:
the amount of oxygen in milligrams dissolved in water needed to break down the organic matter present in one litre of water for five days at `20^(@)C`.
Pure water contains B.O.D. upto 3 ppm. In case, this level is more, it will suggest the presence of organic waste in water which consume oxygen.
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Biochemical Oxygen Demand (BOD) is a measure of:

Biochemical Oxygen Demand (BOD) in a river water