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  2. Unit of measurement - Wikipedia

    en.wikipedia.org/wiki/Unit_of_measurement

    For example, atomic units (au) were designed to simplify the wave equation in atomic physics. [17] Some unusual and non-standard units may be encountered in sciences. These may include the solar mass (2 × 10 30 kg), the megaton (the energy released by detonating one million tons of trinitrotoluene, TNT) and the electronvolt.