1. 5
Uncertainty Lab Notes

3. Exploring and Dealing with Uncertainty
1. Measure the voltage of a single battery with five different analog voltmeters.
1.40 v

5. Exploring and Dealing with Uncertainty
1. Measure the voltage of a single battery with five different analog voltmeters.
1.40 v
1.37 v

7. Exploring and Dealing with Uncertainty
1. Measure the voltage of a single battery with five different analog voltmeters.
1.40 v
1.37 v
1.35 v

9. Exploring and Dealing with Uncertainty
1. Measure the voltage of a single battery with five different analog voltmeters.
1.40 v
1.37 v
1.35 v
1.32 v

11. 1. Measure the voltage of a single battery with five different analog voltmeters.
range
– =
0.08
Uncertainty = range/2
0.04
round to 1 digit
average
1.366
± 0.04
round average to the digit of the uncertainty
1.37
± 0.04 v
same decimal
uncertain digit
uncertainty
average
uncertainty
unit

12. Exploring and Dealing with Uncertainty
2. Measure the voltage of a single battery with five different digital voltmeters.

14. Exploring and Dealing with Uncertainty
2. Measure the voltage of a single battery with five different digital voltmeters.
1.389 v

16. Exploring and Dealing with Uncertainty
2. Measure the voltage of a single battery with five different digital voltmeters.
1.389 v
1.375 v

18. Exploring and Dealing with Uncertainty
2. Measure the voltage of a single battery with five different digital voltmeters.
1.389 v
1.375 v
1.366 v

20. Exploring and Dealing with Uncertainty
2. Measure the voltage of a single battery with five different digital voltmeters.
1.389 v
1.375 v
1.366 v
1.359 v

22. Exploring and Dealing with Uncertainty
2. Measure the voltage of a single battery with five different digital voltmeters.
1.389 v
1.375 v
1.366 v
1.359 v
1.368 v

23. Exploring and Dealing with Uncertainty
2. Measure the voltage of a single battery with five different digital voltmeters.
1.389 v
1.375 v
1.366 v
1.359 v
1.368 v
range
– =
0.030
Uncertainty = range/2
0.015
round to 1 digit
average
1.3714
± 0.02
round average to the digit of the uncertainty
1.37
± 0.02 v
uncertain digit
uncertainty
same decimal
average
uncertainty
unit

24. Determine the average and uncertainty
range
– =
0.40
Uncertainty = range/2
0.20
reject- way off
round to 1 digit
 g
round to 1st decimal
35.4  g

25. Determine the average and uncertaintymm mm mm mm
range
– =
0.003
Uncertainty = range/2
0.0015
round to 1 digit
 mm
round to 3rd decimal
 mm

26. Determine the average and uncertaintycm
1.262 cm
1.261 cm
1.283 cm
range
– =
0.002
Uncertainty = range/2
0.001
round to 1 digit
 cm
round to 3rd decimal
 cm

27. What is wrong with each measurement?
1.37  v
1.37  v
not same decimal place!
1.37  v
1.37  v
uncertainty has one digit
 v
1.370 v 
the unit goes on the end

28. Reading A Burette

29. 39.00 mL
Establish the scale
39.50 mL
40.00 mL
40.05 mL

30. 24.20 mL
The last 0 shows that it is right on the line

31. 1.93 mL