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former term "hardness" has been replaced by the term "sum of alkaline earth", termin "kalkus" on vee puhul kaasajal asendatud terminiga "leelismuldmetallide sisaldus"
materjali võime vastu panna kohalikule plastsele deformatsioonile, signifies, in general resistance to cutting, indendation and/or abrasion, and is actually measured by determing the resistance to indendation definitsioon
