Measurement
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Measurement PowerPoint PPT Presentation


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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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Measurement

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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.


Precision vs accuracy2

Precision vs. Accuracy


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