Percent relative uncertainty

This expression is interpreted as the relative uncertainty in the concentration, as related to the relative uncertainty of the transmittance measurements, ST/T. The graph below illustrates the effect of a 1% uncertainty in transmission measurements on the percent relative uncertainty in the concentration (Fig. 5.8). 

To find the percent relative uncertainty in the sum of Equation 3-4, we write... 

For multiplication and division, first convert all uncertainties into percent relative uncertainties. Then calculate the error of the product or quotient as follows ... 

First convert absolute uncertainties into percent relative uncertainties. 

Then find the percent relative uncertainty of the answer by using Equation 3-6. 

For multiplication and division, use percent relative uncertainty. Absolute uncertainty can be found at the end of the calculation... 

Convert absolute uncertainty info percent relative uncertainty for multiplication. 

You should not work with percent relative uncertainty [100 X (ejx)J in calculations with logs and antilogs, because one side of Equation 3-8 has relative uncertainty and the other has absolute uncertainty. 

A. Write each answer with a reasonable number of figures. Find the absolute and percent relative uncertainty for each answer. 

First, convert absolute uncertainties to percent relative uncertainties ... 

For multiplication and division, convert absolute uncertainty to percent relative uncertainty. 

Rewrite the number 3.123 56 ( 0.167 89%) in the forms (a) number ( absolute uncertainty) and (b) number ( percent relative uncertainty) with an appropriate number of digits. 

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