Question

percentage of hard water in the world​

Answer 1

Answer:

1% pene ke layak pani

Explanation:

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Answer 2

Answer:

Hardness is most commonly expressed as milligrams of calcium carbonate equivalent per litre. Water containing calcium carbonate at concentrations below 60 mg/l is generally considered as soft; 60–120 mg/l, moderately hard; 120–180 mg/l, hard; and more than 180 mg/l, very hard (McGowan, 2000).