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A tire gauge actually expresses the difference in pressure between air inside the tire and the atmospheric pressure. Therefore, if a tire gauge reads 30 lb/in" on a day when the atmospheric pressure is 14 lb/in?, the total tire pressure is 44 lb/in?. Determine the volume of atmospheric air (at 14 lb/in") needed to fill your bike fires (assuming it holds 500 mL of air) to the pressure recommended by the manufacturer (70 Ib/in).