标定(英语:Calibration),即为科学上之校准行为,意指“对某仪器、药物或须有精确单位之物品,其只知的体积、浓度……等刻度或单位之准确度,进行检测是否合乎标准,若否则修正。”

实例

化学上常见的酸碱度标定:以邻苯二甲酸氢钾标定氢氧化钠、利用碳酸钠标定盐酸

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