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SCIENTIFIC MEASUREMENT

SCIENTIFIC MEASUREMENT. QUALitative Measurements. descriptive, non-numeric results: hot / cold heavy / light etc. often influenced by the measurer’s perception. QUANTitative Measurements. definite results – typically numbers with units: 100 °C 32 °F 30 mL 11.4 g/cm 3.

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SCIENTIFIC MEASUREMENT

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  1. SCIENTIFIC MEASUREMENT

  2. QUALitative Measurements • descriptive, non-numeric results: hot / cold heavy / light etc. • often influenced by the measurer’s perception

  3. QUANTitative Measurements definite results – typically numbers with units: 100 °C 32 °F 30 mL 11.4 g/cm3

  4. QUANTitative Measurements definite results – typically numbers with units: only as accurate as the instrument and method used to measure

  5. Accuracy and Precision • accuracy - how close your measurement is to the true value • precision - how close values in a series of measurements are to one another

  6. Significant Figures Math: exact numbers 1 = 1.00 = 1.000000 Science: numbers are measured data – limited in the number of usable digits, or significant figures

  7. Significant Figures • The sig figs in a measurement include all the known digits, plus one last digit that is estimated. • When doing a calculation, the sig figs in the answer depend on the sig figs used in the calculation.

  8. Significant Figures: Rules • Every non-zero digit is significant. • Zeros between non-zero digits are significant. ex: 2008 15.08

  9. Significant Figures: Rules • Zeros in front of significant digits are not significant. ex: 0.04 0.00079

  10. Significant Figures: Rules • Zeros at the end of a number & after a decimal pt are significant. • Zeros at the end of a number without a decimal point are not significant. ex: 690,000 120 14.00

  11. Significant Figures: Rules • Exact or counted numbers have unlimited significant figures. ex: number of students in class number of eggs in a dozen 12 eggs, or 12.00000000… to infinity

  12. Significant Figures: Rules

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