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)
  15. 15. Graduated cylinder
  16. 16. Water displacement
  17. 17. Weight – measure of the gravitational pull on matter
  18. 18. Example : Moon has 1/6 weight</li></li></ul><li>Metric Prefixes<br />Tera- T 1012 1 000 000 000 000 <br />Giga- G 109 1 000 000 000 <br />Mega- M 106 1 000 000 <br />kilo- k 103 1000 <br />hecto- h 102 100 <br />deka- da 10 10 <br />- - - - <br />deci- d 10-1 0.1 <br />centi- c 10-2 0.01 <br />milli- m 10-3 0.001 <br />micro- u (mu) 10-6 0.000 001 <br />nano- n 10-9 0.000 000 001 <br />pico- p 10-12 0.000 000 000 001 <br />
  19. 19. Derived SI units<br />Combination of SI base units<br />Examples<br />Area m2 L x W<br />Volume m3 L x W x H<br />Density Kg/m2 mass/volume<br />Molar mass Kg/mol mass/mole<br />
  20. 20. Volume and Density<br />Volume = Length x Width x Height<br />1 cm x 1 cm x 1 cm = cm<br /><ul><li>Density = mass / Volume</li></ul>Sample Problem 2-1<br />A sample of aluminum metal has a mass of 8.4 g. The volume of the sample is 3.1 cm3. Calculate the density of aluminum.<br />
  21. 21. Density of Some Common SubstancesSubstanceDensity(g/cm3)<br />Air 0.0013 <br />Feathers 0.0025 <br />Wood(Oak) 0.6 - 0.9 <br />Ice  0.92  <br />Water  1.00 <br />Bricks  1.84 <br />Aluminum  2.70 <br />Steel  7.80 <br />Silver  10.50 <br />Gold  19.30  <br />
  22. 22. Conversion Factors<br />Ratio derived from the equality between two different units that can be used to convert from one unit to the other<br /><ul><li>Equalities
  23. 23. 1 dollar = 4 quarters
  24. 24. 1 kg = 1000 g
  25. 25. 1 Km = 0.6213 miles</li></ul>1 dollar4 quarters<br />4 quarter or 1 dollar<br />
  26. 26. Making conversions<br />How many miles are in 15 Km?<br />Write given value:<br />Choose conversion factor<br />Multiply top and divide bottom<br />15 Km x 0.6213 miles = 9.3 miles<br /> 1 Km<br />

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