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Measurement. The comparison of some aspect of an object or phenomenon with a standard unit. How do you properly measure something?. Use a measuring instrument to determine a number. The last digit of your number is always estimated.

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Presentation Transcript
measurement

Measurement

The comparison of some aspect of an object or phenomenon with a standard unit.

how do you properly measure something
How do you properly measure something?
  • Use a measuring instrument to determine a number.
  • The last digit of your number is always estimated.
    • A proper significant figure included all digits as read from the instrument plus one doubtful digit.
how do you properly measure something1
How do you properly measure something?
  • Every number is assigned a unit.
international system of units si units
International System of Units (SI Units)
  • Standard system of measurement used in science
    • Examples:
      • kilogram, centimeter, kilometer, liter, milligram, millimeter, milliliter, degrees Celsius
prefixes
Prefixes
  • Kilo – 1,000
  • Centi – 1/100
  • Milli – 1/1000
precision vs accuracy
Precision Vs Accuracy
  • Precision
    • How reproducible a measurement is.
precision vs accuracy1
Precision vs. Accuracy
  • Accuracy
    • How correct a measurement is.
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