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hydrometer

noun [C]
 
 
/haɪˈdrɒ.ɪ.tər/ US  /-drɑː.mə.t̬ɚ/ specialized

Definition

a piece of equipment used to measure the density (= amount of matter in a particular quantity) of liquids, especially a long glass tube, closed and with a weight at one end so that it floats verticallyLaboratory equipment
(Definition of hydrometer noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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