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Why Do We Need a System of Measurement ?

Why Do We Need a System of Measurement ?. Which would you prefer? 2lbs of gold or 1 kilogram of gold?. 1 kilogram of Gold. 2 lbs of Gold. How do you know if you are getting the same amount as everyone else without a standard to compare it to?.

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Why Do We Need a System of Measurement ?

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  1. Why Do We Need a System of Measurement ?

  2. Which would you prefer? 2lbs of gold or 1 kilogram of gold? 1 kilogram of Gold 2 lbs of Gold How do you know if you are getting the same amount as everyone else without a standard to compare it to?

  3. A “standard” is something used as a comparison for measurement • 2 Important factors for standards: • Must be available for everyone and something in nature that is the same all over the earth • The standard must never vary

  4. English System of Measurement • The English System of Measurement is commonly used as the day to day system in the United States. • Pounds • Feet • Gallons • But what are the standards for these units? • there are no standards in nature for these units, the rest of the world has moved to another measurement system.

  5. International System of Units (SI) • Modern Form of the Metric System • Units of measurement devised around 7 base units • Works on a scale of 10 • Prefixes are used to distinguish between base units • Use of conversion factors

  6. Know these SI prefixes: 109 106 1000 100 10 0.1 0.01 0.001 10-6 10-9 1 Conversion Factors: ratio of equivalent measurements 1 m = 10 dm 1 m = 100 cm 1 m = 1000 mm

  7. SI Units of Measurement

  8. An approximate comparison of the two systems: There are exact conversion factors that can be used to change units in one system to units in the other. The table above might help you begin to visualize the size of the units of the metric system.

  9. SIGNIFICANT FIGURES

  10. LET’S TRY A FEW • a) 1.020 ________sig figs • b) 45.0 ________sig figs • c) 154 ________sig figs • d) 0.00003 ________sig figs • e) 54,000,000 ________sig figs 4 3 3 1 2

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