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

2. How do you properly measure something? Use a measuring instrument to determine a number. Use a measuring instrument to determine a number. The last digit of your number is always estimated. 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. A proper significant figure included all digits as read from the instrument plus one doubtful digit.

3. How do you properly measure something? Every number is assigned a unit. Every number is assigned a unit.

4. International System of Units (SI Units) Standard system of measurement used in science Standard system of measurement used in science Examples: Examples: kilogram, centimeter, kilometer, liter, milligram, millimeter, milliliter, degrees Celsius kilogram, centimeter, kilometer, liter, milligram, millimeter, milliliter, degrees Celsius

5. Prefixes Kilo – 1,000 Kilo – 1,000 Centi – 1/100 Centi – 1/100 Milli – 1/1000 Milli – 1/1000

6. Precision Vs Accuracy Precision Precision How reproducible a measurement is. How reproducible a measurement is.

7. Precision vs. Accuracy Accuracy Accuracy How correct a measurement is. How correct a measurement is.

8. Precision vs. Accuracy