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# Chapter 2.2 : Units of Measurement

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### Chapter 2.2 : Units of Measurement

1. 1. UNITS OF MEASUREMENT<br />SECTION 2-2<br />
2. 2. Objectives<br />Distinguish between a quantity, a unit, and a measurement standard<br />Name SI units for length, mass, time, volume, and density<br />Distinguish between mass and weight<br />Perform density calculations<br />Transform a statement of equality to a conversion factor<br />
3. 3. Units of measurement<br />Quantity – magnitude, size, or amount<br />5 2,000,000 0.030o<br /><ul><li>Units – compare what is measured with defined size
4. 4. mL g feet
5. 5. Quantity has no meaning without the unit
6. 6. 5 mL 100 g 2,000,000 feet</li></li></ul><li>SI Measurement<br />Le Systeme International d’Unites<br />Adopted 1960 as world-wide agreed upon standards<br /><ul><li>Base units
7. 7. length meter m
8. 8. mass kilogram    kg
9. 9. time second s
10. 10. temperature  kelvin K
11. 11. amount of substance mole mol
12. 12. Volume Liters L</li></li></ul><li>Some SI Base Units<br />Mass – measure of the amount of matter in an object<br />Grams (g)<br />Electronic scale or triple beam balance<br /><ul><li>Volume – amount of space an object takes up
13. 13. Liters L
14. 14. V = L X W X H (cm3)