w/w
an abbreviation for "by weight," used in chemistry and pharmacology to describe the concentration of a substance in a mixture or solution. Properly speaking, 2% w/w means that the mass of the substance is 2% of the total mass of the solution or mixture. The metric symbol g/g has the same meaning as w/w.
翻译如下：
意为“质量比”的缩写，常用于化学及药理学，描述某物质在混合溶液中的浓度。比方说，2% w/w 意思是这种物质占溶液总质量的2%。公制单位g/g与其意思相同。
打字不易，如满意，望采纳。
温馨提示：答案为网友推荐，仅供参考