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Scientific Measurement

Scientific Measurement. Notes 3. Metric System. International System of Units (SI system) Based on multiples of 10. Uses prefixes. Accepted and understood by all scientists. U.S. does not use the metric system. SI Base Units. Meter  measure length. Distance between two points.

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Scientific Measurement

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  1. Scientific Measurement Notes 3

  2. Metric System • International System of Units (SI system) • Based on multiples of 10. • Uses prefixes. • Accepted and understood by all scientists. • U.S. does not use the metric system.

  3. SI Base Units • Metermeasure length. • Distance between two points. • Liter measure volume. • Amount of space an object occupies. • Gram  measure mass. • How much matter is in an object.

  4. Other SI units • Kelvin temperature • Time  seconds • g/cm3 or g/mL  Density • Amount of mass per unit of volume • Derived unit: two or more SI units together.

  5. SI Prefixes • King Hector Doesn’t Usually Drink Cold Milk • Kilo- : 1000 • Hecto- : 100 • Deca- : 10 • Unit • Deci- : 1/10 • Centi- : 1/100 • Mili- : 1/1000

  6. Metric System Ladder • Kilo HectoDecaUnitdecicentimilli • K H D unit d c m gram liter meter

  7. In middle school…. • You used the metric ladder. In high school…. • You use conversion factors. Ooooh…aaahh! • Practice soon to come!

  8. Accuracy and Precision • What is accuracy? • Capable of providing a correct reading. • What is precision? • Repeatable, reliable, getting around the same measurement each time.

  9. Neither Both Accurate, precise, both, neither? Precise Accurate

  10. Measuring Volume • Read under the meniscus!

  11. Mass Vs. Weight • Mass: amount of matter an object is made up of. • Weight: the amount of gravitation pull on an object. Which one will change if you are on a different planet? http://www.exploratorium.edu/ronh/weight/

  12. Questions?

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