標定(英語:Calibration),即為科學上之校準行為,意指「對某儀器、藥物或須有精確單位之物品,其只知的體積、濃度……等刻度或單位之準確度,進行檢測是否合乎標準,若否則修正。」

實例

化學上常見的酸鹼度標定:以鄰苯二甲酸氫鉀標定氫氧化鈉、利用碳酸鈉標定鹽酸

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