Hardness: nf Hardness is the character of what is hard.
Property of what resists pressure, touch; of what does not let itself be easily touched. Glass hardness. Degree of hardness of a substance (consistency).
In physics: Resistance of a solid to penetration. Mohs hardness scale (10 degrees).
In the figurative sense: Water hardness: character of the water which contains calcium and magnesium salts and does not produce foam with the soap (hydrotimetry).
Temp hardness...
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