5.43 - Percentage measurement uncertainty

Question 1

What is percentage uncertainty?

Answer 1

The actual measurement uncertainty multiplied by 100 and then divided by the value recorded

Question 2

If you are doing a calculation where two values have uncertainties associated with them, what do you do?

Answer 2

You do the calculation as normal, and the uncertainty is the sum of all the individual percentage uncertainties

Question 3

What does the percentage uncertainty of a balance rely on?

Answer 3

• The precision of the mass balance

- The mass being weighed