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Chemistry

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Analytical Chemistry

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Chemical Applications of Statistical Analyses

Measuring and Reporting Uncertainty

Description

Uncertainty is part of analytical chemistry measurement. When repeated measurements are taken, random errors can cause the results to differ in small ways. These repeated values are compared with the estimated or expected value to judge how much uncertainty is present.

Uncertainty is usually writ...

Transcript

不确定性反映了测量结果可能存在的数值范围。

然而,不确定性与误差不同,误差是指测量结果与真实值之间的差异。

在表示时,数值的不确定度置于结果量值的右侧,以有效数字表示。

有效数字是指在不损失精度的情况下表示结果所需的位数。有效数字的位数包括所有确定的数字以及其右侧的不确定数字。

不确定性可以用绝对尺度和相对尺度来表示。

绝对不确定度是指结果在两个方向上可能变化的范围。相反,相对不确定度是绝对不确定度与结果量值的比值。

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