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Measurements And Sig Figs
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Measurements And Sig Figs

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  • 1. Precision
    Precision measures the reproducibility of your value.
    Precise means “repeatable, reliable, getting the same measurement each time.”
  • 2. Accuracy
    Accuracy is the extent to which a measurement approaches the true value.
    Accurate means "capable ofproviding a correct reading or measurement." A measurement is accurate if it correctly reflects the size of the thing being measured.
  • 3. Measurements
    All of our measurements must have units on them.
    The SI system is used
    Use the metric system
    Mass is in grams (g)
    Length is in meters (m)
    Volume in liters (L)
  • 4. Metrics
  • 5. Temperature
    A measure of the average kinetic energy of the particles in the sample
    The SI unit is Celcius (C)
    TF = 1.8tC + 32
  • 6. Taking Measurements
    Always estimate one digit passed the last readable digit
    This shows the uncertainty in our measurements
  • 7. Significant Figures
    When a measurement is recorded only those digits that are dependable are written down.
  • 8. Rules for Counting Sig Figs
    Nonzero integers always count as significant figures
    3456 has 4 sig figs.
    Leading zeros are never significant
    0.000757 has 3 sig figs
    Captive zeros always count as significant figures
    16.07 has 4 sig figs
    Trailing zeros are significant only if the number contains a decimal point.
    9.300 has 4 sig figs
  • 9. Mathematical Operations and Sig Figs
    (+) and (-) : # sig figs in the result equals the number of decimal places in the least precise measurement.
    6.8 + 11.934 =
    22.4896  22.5
    (3 sig figs)
    (x) and (÷) : # sig figs in the result equals the number in the least precise measurement used in the calculation.
    6.38  2.0 =
    12.76  13 (2 sig figs)
  • 10. Scientific Notation
    Allows easy conversion from decimal form to powers of 10
    Always have one number before the decimal
    4567 = 4.567x103
    0.000345 = 3.45x10-4
    The number after the 10 tells you how many spaces to move the decimal to the left or right
    Shows how many of the numbers are significant