Consequently, a fluid ounce of water weighs about 1.041 ounces avoirdupois. The avoirdupois ounce is lighter than the troy ounce; . The dram in avoirdupois weighs just under half of the dram in apothecaries'. One carat is defined as 200 milligrams (about 0.007 ounces avoirdupois). Although the troy ounce is larger than its Avoirdupois equivalent, the pound is smaller. An avoirdupois pound is equal to 16 avoirdupois ounces and to exactly 7,000 grains. The modern definition of the avoirdupois pound (1 lb) is exactly kilograms. The pound avoirdupois was divided into 16 ounces. During the reign of Queen Elizabeth, the avoirdupois pound was redefined as 7,000 troy grains. The US uses pounds and ounces (avoirdupois) for weight, and US customary units for volume. It also equals avoirdupois ounces, or exactly , about 10% larger. It was equivalent to between 21 and 28 avoirdupois ounces (about 600-800 grams). Unlike the previous standard, the new pound standard was a pound avoirdupois. The avoirdupois pound was defined in prototype, rated as to grains. Amongst these were the avoirdupois pound and the obsolete Tower, merchant's and London pounds.