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Significant Figures and Measuring Devices

Significant Figures and Measuring Devices. CHM 101. Sinex. Two identical length rulers with different calibrations. 1 meter. What is the length?. What is the width?. Significant Figures (SF) – Every digit you are sure of plus one place estimated. Calculate the area of the box (LxW).

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Significant Figures and Measuring Devices

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  1. Significant Figures andMeasuring Devices CHM 101 Sinex

  2. Two identical length rulers with different calibrations. 1 meter

  3. What is the length? What is the width? Significant Figures (SF) – Every digit you are sure of plus one place estimated

  4. Calculate the area of the box (LxW). When multiplying/dividing: fewest number of SF’s rules 0.9 x 0.4 = 0.36 = 0.4 m2 Calculate the perimeter of the box (2L+2W). When adding/subtracting: least number of decimal places rules 0.9 + 0.9 + 0.4 + 0.4 = 2.6 m How would you improve your results?

  5. What is the length? What is the width?

  6. Calculate the area of the box (LxW). 0.9 x 0.42 = 0.38 = 0.4 m2 Calculate the perimeter of the box (2L+2W). 0.9 + 0.9 + 0.42 + 0.42 = 2.6 m How would you improve your results?

  7. What is the length? What is the width?

  8. Calculate the area of the box (LxW). 0.88 x 0.42 = 0.37 m2 Calculate the perimeter of the box (2L+2W). 0.88 + 0.88 + .42 +.42 = 2.60 m How would you improve your results? Need a ruler calibrated to 0.01 m

  9. For any measuring device you can read it to one place better than it is calibrated. Thermometer - Calibrated to every 1 degree Read to every 0.1 degree Buret - Calibrated to every 0.1 mL Read to every 0.01 mL

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