Measurement

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# Measurement - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Measurement' - akiko

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Presentation Transcript

### 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.
• A proper significant figure included all digits as read from the instrument plus one doubtful digit.
How do you properly measure something?
• Every number is assigned a unit.
International System of Units (SI Units)
• Standard system of measurement used in science
• Examples:
• kilogram, centimeter, kilometer, liter, milligram, millimeter, milliliter, degrees Celsius
Prefixes
• Kilo – 1,000
• Centi – 1/100
• Milli – 1/1000
Precision Vs Accuracy
• Precision
• How reproducible a measurement is.
Precision vs. Accuracy
• Accuracy
• How correct a measurement is.