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Measurement

Measurement. Metric System. Customary Units. English system A collection of unrelated units Includes: inches, feet, ounces, pounds, gallons, etc. SI. International System of Units Scientists us it to communicate. The Metric System is a universal s ystem Easy to use and easy to convert

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Measurement

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  1. Measurement Metric System

  2. Customary Units • English system • A collection of unrelated units • Includes: inches, feet, ounces, pounds, gallons, etc.

  3. SI • International System of Units • Scientists us it to communicate • The Metric System is a universal system • Easy to use and easy to convert • Units are related • Units are in 10’s

  4. Base Units • Length = Meter (m) • Mass (weight) = gram (g) • Volume = liter (l) • Temperature = ⁰C • Time = seconds

  5. Prefixes • Kilo • Hecto • Deka • Base Unit • Deci • Centi • Milli Kilo 1,000 Hecto 100 Deka 10 Base Unit 1 Deci 0.1 Centi 0.01 Milli 0.001

  6. K H D B D C M ied enry rinking hocolate y ing ilk

  7. Length • Distance between 2 points • Tool: ruler or meterstick • Base unit = meter • 1m=_________cm • 1m=________mm • _______m = _______km 100 1000 1000 1

  8. Mass • Quantity of matter in an object (weight) • Tool = triple beam balance • Base unit = gram

  9. Using a Triple Beam Balance • Set the weight on each of the 3 beams at zero • Make sure the lines on the left and right are even • Set object on scale • Always start with the biggest weight, move it until the arm drops, then move it back one position • Move to the middle weight, and repeat the above step • End by sliding the smallest weight until the lines on the left and right are even again • Add the number of each of the weights together to find mass

  10. Volume • Amount of space occupied by an object • Tool = graduated cylinder • Base unit = liter

  11. What causes the meniscus? A concave meniscus occurs when the molecules of the liquid attract those of the container. The glass attracts the water on the sides. Using a Graduated Cylinder • Determine the amount of each mark on the scale • Read it at its lowest position (meniscus) • Measure at eye level

  12. Micrometer • A unit of length equal to one thousandth (10-3) of a millimeter or one millionth (10-6)of a meter. • http://www.linnbenton.edu/auto/day/mike/read.html

  13. Digital Scale • More accurate than a triple beam balance. • Used to measure to the thousandths place…milligram. • Example: If a known calibration standard weight of 100.000 grams was placed on the Scientech SP250 and the display shows 100.002 grams we could say the accuracy of the balance is 0.002 grams or 2 milligrams. Accuracy tells how close a balance gets to the real value.

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