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    H
    /eɪtʃ/

    abbreviation

    • 1. hard (used in describing grades of pencil lead): "a 2H pencil"
    • 2. height (in giving the dimensions of an object): "H 195 cm by W 107 cm by D 52 cm"

    symbol

    • 1. enthalpy.
    • 2. the chemical element hydrogen.

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