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Chemistry

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Analytical Chemistry

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Chemical Applications of Statistical Analyses

How Uncertainty Changes in Calculations

Description

Uncertainty changes as measurements move through calculations. In a multi-step experiment, each measurement adds some uncertainty. Because the steps happen one after another, the uncertainty from one step carries into the next step and affects the final result.

The way uncertainty is combined dep...

Transcript

在实验中,通常需要多次运算。在这里,与第一次测量相关的不确定性以级联序列传播到下一次测量。

了解与每次测量相关的不确定性,就可以根据所有算术运算的随机误差来估计不确定性。

对于加法和减法运算,结果的绝对不确定性是以绝对方差表示的不确定性之和的平方根。

对于乘法和除法运算,结果中的相对不确定性是计算为相对方差的不确定性之和的平方根。

对于指数函数运算,结果中的相对不确定性是基值乘以指数的相对不确定性。

Tags

Addition SubtractionMultiplication DivisionExponential FunctionsAbsolute UncertaintyRelative UncertaintyStatistical AnalysisExperimental ProtocolsUncertainty Propagation

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