7 Uncertainty Lab Notes

1. 7 Uncertainty Lab Notes

2. 1.25.3  0.2 mm The measurement is between 25.1 mm and 25.5 mm 2. 25.35  0.01 mm The measurement is between 25.34 mm and 25.36 mm less precise more uncertainty 25.1 25.3 25.5 25.34 25.35 25.36 more precise less uncertainty

3. Is there a difference between the following measurements? 5 m 5.0 m 5.00 m 5.000 m Uncertain digit Range PrecisionUncertainty lowhigh 4 - 6 4.9 - 5.1 4.99 - 5.01 highlow 4.999 - 5.001

4. Reading a Micrometer All micrometer units are in mm. Fixed Scale Rotating Scale Measurement 5.00 mm 0.21 mm 5.21 mm

5. Reading a Micrometer All micrometer units are in mm. Fixed Scale Rotating Scale Measurement 10.50 mm 0.31 mm 10.81 mm

6. Reading a Vernier ScaleAll units are in mm. What lines up the best with a line above? Fixed Scale Vernier Scale Measurement 12.00 mm 0.05 mm 12.05 mm 0.05

7. Reading a Vernier ScaleAll units are in mm What lines up the best with a line above? Fixed Scale Vernier Scale Measurement 15.00 mm 0.60 mm 15.60 mm 0.60

8. Reading a Vernier Scale All units are in mm. 0.50 Fixed Scale 8.00 mm Vernier Scale 0.50 mm Measurement 8.50 mm

9. Uncertainty and Significant Figures 1.370.02v Uncertainty is a one digitnumber that indicates the range in which the accepted or true value most likely lies- 95%. Uncertainty is the natural variationthat is inherent in all measurement. All measuredvalues, those with units, have uncertainty.

10. The last digitof the measured value is the only digitthat contains uncertainty and is in the same decimalplace as the uncertainty. 1.370.02v Average  Uncertainty Unit The uncertainty is only one digit. The unit goes last.

11. Good Accuracy- how close to the accepted value the measurement is. x x x x x

12. Good Precision Poor Accuracy x x x x x

13. Poor Precision Poor Accuracy x x x x x

14. Homework Lab Conclusion and Questions Do Ionic Formulas Quiz