安士
安士（粵拼：on1 si2，借自英文：Ounce，oz）係英制重量單位，有幾種唔同定義，通常係指「常衡安士」，1安士有28.350克或者十六分一磅，而另一種幾常用嘅係「金衡安士」，1安士有31.1035克或者十二分一金衡磅。
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