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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