1.

Which of the below given formulas is used to calculate hardness coefficient?(a) (Final hardness / initial hardness) × 100%(b) 20 – (loss in weight / 2)(c) 20 – (loss in weight / 3)(d) ((20 – loss in weight) / 3) × 100%

Answer» The correct choice is (c) 20 – (loss in weight / 3)

The best explanation: The coefficient of hardness is expressed as a number and not a percentage.


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