Measurement, Notation

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Measurement, Notation Siggy Figgies
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Qualitative Measurements

• Descriptive
• Non numerical
• Its hot

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Quantitative Measurement

• (think of the root word Quantity)
• Results in a definitive form
• Usually numerical
• Its 33ºC

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Percent Error

• Reference Tables p. 12, Table T
• (find it)

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Scientific Notation

• Number consisting of a coefficient multiplied by
  10 raised to an exponential power
• 36,000 3.6 x 104
• 8.1 x 10-3 0.0081

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Significant Figures

• a.k.a Siggy Figgies

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• All non zeros are considered significant
• 0.141 has 3 siggy figgies

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• Zeros between non zero numbers ARE Significant
• 7003 has 4 siggy figgies
• 40.7 has 3

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• Zeros before the decimal point by themselves are
  NOT significant
• All zeroes to the left are NOT significant
• All these have 2 siggy figgies
• 0.0071
• 0.42
• 0.0000099

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• Zeroes to the right of the decimal point that
  come at the end of a number ARE significant
• 43.00
• 1.010

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• Zeroes to the right where there is no decimal
  point are NOT significant
• 7000
• 300
• 21000
• To avoid confusion, these can be written in
  scientific notation
• 2.10 x 104

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Unlimited siggy figgies

• When you count something
• (there are exactly 26 students, not 25.9 or 26.2)
• Units by definition 60 seconds in 1 minute

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Rounding to the siggy figgies

• When doing calculations, you round the answer to
  the correct number of significant figures
• The answer cannot be more precise than any of the
  measurements.
• Generally look to the answer with the most number
  of sig. figs. after the decimal point.