1 / 37

Science

Science. Basic Measurements. Accuracy and Precision. Accuracy is how close your measurement is to the actual value. Precision is how close your measurements match each other. D. Distance or Length. This nickel is 2.7 cm. This slide is 7.7 cm. or is it?.

chelsey
Download Presentation

Science

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Science Basic Measurements

  2. Accuracy and Precision • Accuracy is how close your measurement is to the actual value. • Precision is how close your measurements match each other.

  3. D

  4. Distance or Length This nickel is 2.7 cm

  5. This slide is 7.7 cm

  6. or is it? 7.6 cm, always read with your eye perpendicular to the measurement.

  7. Volume • When measuring with a graduated cylinder the measurement is read perpendicular to the graduated cylinder at the bottom of the curve of the liquid called the meniscus.

  8. Mass • Record the measurement as displayed. Digital balances

  9. Lab Time!!!!! • Divide up into three equal sized groups. • Each group will work at each station. • When complete we will compare and contrast measurements within and between the groups.

  10. International System of Units • Aka, The Metric System. • Based on multiples of 10.

  11. First let’s multiply and divide by multiple of 10.

  12. 2.5 X 10 = • 2.5 X 10 = 25 • 0.75 X 1000 = • 0.75 X 1000 = 750 • 3.0 X 100 = • 3.0 X 100 = 300

  13. 350/10 = • 350/10 = 35 • 150/100 = • 150/100 = 1.5 • 103/1000 = • 103/1000 = 0.103

  14. Money • Our monetary system is mostly based on multiples of 10. • 1000>100>10>1>0.10>0.01>0.001 • Check out these wonderful EXAMPLES!

  15. 0.001 0.01 X 10 =

  16. 0.01 0.10 X 10 =

  17. 0.10 1.00 X 10 =

  18. ___________________ X 10

  19. X 10 _____________________

  20. X 10 ____________________

  21. That was EASY and so is the metric system.

  22. Prefixes • Prefixes are used to change from one multiple of 10 to the next in the metric system. • We don’t measure tiny objects with large units or large objects with tiny units.

  23. Everyday Metric Prefixes WHOA! That’s a lot of prefixes. But don’t be afraid, only a few are used in everyday common measurements. kilo hecto deka base deci centimilli 1000 100 10 1 0.1 0.01 0.001

  24. Putting it all together • 7 Base metric units and abbreviations: • meter (m) • second (s) • Kilogram (kg) • Ampere (A) • Kelvin (K) or Celsius C • Mole (mol) • Candela (cd)

  25. Once again, only a few are used in everyday life. • Meter (m) to measure length. • Kilogram (kg) to measure mass. • Liter (L) , a derived unit, to measure volume. • Seconds (s) to measure time. • Kelvin (K) and Celsius C to measure temperature.

  26. Here’s a meter stick!

  27. It takes 10 decimeters to make up 1 meter.

  28. It takes 10 centimeters to make up 1 decimeter.

  29. If 1 meter = 10 decimetersand1 decimeter = 10 centimetersthen how many centimeters make up 1 meter?

  30. That’s right!10dm/1m X 10 cm/1dm = 100 cm

  31. If 1 meter = 10 decimetersand1 decimeter = 10 centimetersand1centimeter = 10 millimetersthen how many millimeters make up 1 meter?

  32. That’s right!1 m = 10 dm/1 m X 10 cm/1 dm X 10 mm/1 cmwhich = 1000 mm

  33. It’s the same for mass and volume 1 kg = 10 hg = 100 dag = 1000 g 1 L = 10 dL = 100 cL = 1000 mL

  34. Is it now obvious that the SI or metric system is easier than the English system of units?

  35. You must simply multiply or divide by a multiple of 10 to change from one size unit to another size unit.

  36. Remember “All things are difficult before they are easy” ~Thomas Fuller

More Related