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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.

Measurement

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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.

• 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.