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The International System of Measurement (SI)

The International System of Measurement (SI). SI. System of measurement used world wide Makes communication between countries, languages and different measurement systems easy, consistent Uniformed – everyone is “speaking the same language”. Prefixes. Used to change the size of the value

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The International System of Measurement (SI)

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  1. The International System of Measurement(SI)

  2. SI • System of measurement used world wide • Makes communication between countries, languages and different measurement systems easy, consistent • Uniformed – everyone is “speaking the same language”

  3. Prefixes • Used to change the size of the value • Used in front of the base unit • Used to make large numbers smaller and smaller numbers larger • Does not change the value itself

  4. Common Prefixes

  5. Unit Conversions • Used to change from one sized unit to another • Value does not change only the size of the unit ex: 1 dollar = 100 pennies = 20 nickels = 10 dimes = 4 quarters Value ($1) remains the same, just the size of the unit changes

  6. Tools of Measurement • Equipment used to measure mass, length, volume and temperature • Each tools measures in its own unit • The smaller the unit the more accurate the measurement

  7. Tools of measurement (con’t)

  8. M V M D = D V C. Derived Units • Combination of base units. • Volume - length  length  length 1 cm3 = 1 mL 1 dm3 = 1 L • Density - mass per unit volume (g/cm3)

  9. The Perfect Graph • 6 points all graphs need to have 1. Title 2. Label Axis w/ correct units 3. Choose an appropriate interval for axis (Make it big enough!) 4. Use a straight edge 5. Best fit line 6. slope should be in decimal form.

  10. Mass (g) Volume (cm3) D. Graphing & Density

  11. M D V E. Density • An object has a volume of 825 cm3 and a density of 13.6 g/cm3. Find its mass. GIVEN: V = 825 cm3 D = 13.6 g/cm3 M = ? WORK: M = DV M = (13.6 g/cm3)(825cm3) M = 11,220 g

  12. WORK: V = M D V = 25 g 0.87 g/mL M D V E. Density 1) A liquid has a density of 0.87 g/mL. What volume is occupied by 25 g of the liquid? GIVEN: D = 0.87 g/mL V = ? M = 25 g V = 28.7 mL

  13. WORK: D = M V D = 620 g 753 cm3 M D V D. Density 2) You have a sample with a mass of 620 g & a volume of 753 cm3. Find density. GIVEN: M = 620 g V = 753 cm3 D = ? D = 0.82 g/cm3

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