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Ways of Measuring…

Ways of Measuring…. List as many ways of measuring as you can Compare with a partner. M E T R O L O G Y. The Metric System. The metric system was devised by French scientists in the late 18th century

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Ways of Measuring…

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  1. Ways of Measuring… • List as many ways of measuring as you can • Compare with a partner

  2. METROLOGY

  3. The Metric System The metric system was devised by French scientists in the late 18th century It was- and is- intended to maintain a worldwide standard for measurement (vs. English Standard) It is based on the number 10 Because of this, it is easy to convert from unit to another Why do we want to be able to convert units?

  4. Linear Measurement(standard unit = meter) Prefix Abbreviation Fraction Decimal Milli mm 1/1000 .001 Centi cm 1/100 .01 Deci dm 1/10 .1 Meter m 1/1 1. Deka dk 10/1 10. Hecto hm 100/1 100. Kilo km 1000/1 1000.

  5. Estimating Metric Units • A mmis about the width of your pencil lead • Acmis about the width of your pinkie finger • Admis the length of a cassette tape • Amis about the height of a door knob • Adkis about the length of this classroom • Ahmis about the length of a soccer pitch • Akmis about the distance from RMS to Riverside Park

  6. Unit Comparison- OBSERVE! • 10 mm = 1 cm • 100 mm = 1 dm • 1,000 mm = 1 m • 10,000 mm = 1 dk • 100,000 mm = 1 hm • 1,000,000 mm = 1 km

  7. Unit Comparison- con’t… • 10 cm = 1 dm • 100 cm = 1 m • 1,000 cm = 1 dk • 10,000 cm = 1 hm • 100,000 cm = 1 km • 10 dm = 1 m • 100 dm = 1 dk • 1,000 dm = 1 hm • 10,000 dm = 1 km

  8. If all else fails, try this… km <> hm <> dk <> m <> dm <> cm <> mm Actually use your finger to move the decimal This allows you to convert from one unit to another easily

  9. Reading a Meter Stick Be sure to close one eye and get object lined up at eye level. What is the EXACT length of this object?

  10. Be sure to get at eye level… Why? How tall am I anyway?

  11. ALWAYS… • Estimate • Measure twice • If you get the same measurement, then you can be reasonably assured you’re correct • What should you do if you DON’T get the same measurement?

  12. WEIGHTjustaminute!

  13. Weight VS. Mass • Weight is the measure of gravity • It can change depending on the body that is influencing the object • You weigh less on a mountain top than at sea level • Let’s calculate our weights on different planets… Earth’s Moon: .16 Jupiter: 2.60 Mars: .39 Pluto (dwarf planet): .05

  14. So, what’s MASS? • Mass is the measure of matter in an object • It will not change depending on location • It’s that property that makes mass ideal for science • In the metric system, mass is measured in GRAMS • So, the gram is the basic or standard unit of mass in the metric system • We will use a triple beam balance to measure mass

  15. Triple Beam Balance Rider Beams located on ARM Pan Base

  16. Closer look at the beams w/ weights (AKA: Poise or riders) Gram/ .1 g 100 grams 10 grams

  17. Zero in your balance • Move all the riders to zero • Use the adjustment screw/ knob to get the arm lined up with zero on base • Torque…

  18. What does this balance read?

  19. 100 g poise is at 300 10 g poise at 70 1 g poise at 3.34 Total mass is 373.34 grams!

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