Karaat (ct) on massiühik, mis võrdub 200 mg, ja mida kasutatakse vääriskivide ja pärlite mõõtmiseks. Praegune määratlus võeti vastu 1907. aastal 4. Kaalude ja Mõõtude Peakonverentsil ning varsti pärast seda paljudes maailma riikides. Karaat jagatakse sjaks 2 milligrammiliseks punktiks.
The carat (ct) is a unit of mass equal to 200 mg, which is used for measuring gemstones and pearls. The current definition, was adopted in 1907 at the Fourth General Conference on Weights and Measures, and soon afterwards in many countries around the world. The carat is divisible into 100 points of 2 mg.
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