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1-5 Measurement

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Transcript

  • 1. 1-5 Measurements
    • Compare and contrast accuracy and precision.
  • 2. Accuracy & Precision
    • Accuracy is how close to the accepted value.
    • Precision is how close a series of measurements are to each other.
  • 3. Accuracy & Precision (cont.)
  • 4. Accuracy & Precision (cont.)
    • Students collected density data for powered sucrose.
    • The accepted density is 1.59 g/cm 3 .
    Density Data Collected by Three different Students Student A Student B Student C Trial 1 1.54 g/cm 3 1.40 g/cm 3 1.70 g/cm 3 Trial 2 1.60 g/cm 3 1.68 g/cm 3 1.69 g/cm 3 Trial 3 1.57 g/cm 3 1.45 g/cm 3 1.71 g/cm 3 Average 1.57 g/cm 3 1.51 g/cm 3 1.70 g/cm 3
  • 5. 1-5 Summary
    • What is the difference between accuracy and precision?
    • Which temperature units are used in science?