| NOUN | substance | hard water | water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap |
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| Meaning | water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap. | |
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| Broader | water, H2O | binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid / liquid |
| Opposite | soft water | water that is not hard (does not contain mineral salts that interfere with the formation of lather with soap) |
| Catalan | duresa de l'aigua | |
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