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What is the full form of NTU in context with turbidity?

(a) Number of transfer unit

(b) Neurological turbidity unit

(c) Nephelometric turbidity unit

(d) Network terminal unit

I had been asked this question in quiz.

The question is from Physical characteristic of Water in division Quality of Water of Environmental Engineering

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Right choice is (c) Nephelometric turbidity unit

To explain I would say: The value of turbidity measured by nephelometer is expressed in terms of NTU. Sometimes, it is referred as FTU or Formazin turbidity unit.

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