<P> A pint glass is a form of drinkware made to hold either a British ( `` imperial '' ) pint of 20 imperial fluid ounces ( 568 ml ) or an American pint of 16 US fluid ounces ( 473 ml ) . These glasses are typically used to serve beer , and also often for cider . </P>
what does the m number mean on a pint glass
imperial fluid ounces