<P> The cup is an English unit of volume, most commonly associated with cooking and serving sizes . It is traditionally equal to half a liquid pint in either US customary units or the British imperial system but is now separately defined in terms of the metric system at values between ⁄ and ⁄ of a liter . Because actual drinking cups may differ greatly from the size of this unit, standard measuring cups are usually used instead . </P> <P> The cup currently used in the United States for nutrition labelling is defined in United States law as 240 ml . </P>

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