盎司
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定义
双用途英制单位：作为质量单位（常衡），1 oz = 28.3495 g（1/16磅）；作为容量单位，1美制液体盎司 = 29.5735 mL。
解释
The mass ounce and fluid ounce are separate units that should not be confused. One US fluid ounce is defined to make a pint of water weigh approximately one pound — a practical approximation since water's density is close to 1 g/mL. Gold and silver use the troy ounce (31.1035 g), which is heavier than the avoirdupois ounce. Nutrition labels in the US commonly express serving sizes in ounces.
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