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| Subject | English | Estonian |
| gen. | Brinell hardness | Brinelli kõvadusarv |
| gen. | Brinell hardness number | Brinelli kõvadusarv |
| met., tech. | Rockwell hardness | Rockwelli kõvadus |
| met., tech. | Rockwell Hardness C | Rockwelli kõvaduse C-skaala |
| environ. | water hardness The amount of calcium and magnesium salts dissolved in water | vee karedus |