The difference between Hard water and Heavy water
When used as nouns, hard water means water with a high concentration of dissolved minerals, especially calcium, making it difficult to lather with soap, whereas heavy water means water containing deuterium instead of normal hydrogen (symbol d2o).
check bellow for the other definitions of Hard water and Heavy water
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Hard water as a noun (chemistry):
Water with a high concentration of dissolved minerals, especially calcium, making it difficult to lather with soap.
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Heavy water as a noun (chemistry):
Water containing deuterium instead of normal hydrogen (symbol D2O); used as a moderator in nuclear reactors.