1 / 25

Calibration, Temperature & Percent Error

Calibration, Temperature & Percent Error. What is Calibration?. Calibration of any measuring device is: distance between two closest lines ( N ot distance between two closest # ’ s!). Not all graduated cylinders calibrated same way. Large graduated cylinder: ? capacity ? calibration.

dulcea
Télécharger la présentation

Calibration, Temperature & Percent Error

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. Calibration, Temperature & Percent Error

  2. What is Calibration? Calibration of any measuring device is: distance between two closest lines (Not distance between two closest #’s!)

  3. Not all graduated cylinders calibrated same way

  4. Large graduated cylinder: ? capacity ? calibration 1000 ml 10 ml

  5. ? calibration 1 ml

  6. ? calibration 1 ml

  7. ? calibration 0.2 ml

  8. Here are some other pieces of lab equipment. Can you figure the calibration of each?

  9. meter stick: two closest lines are 1 millimeter apart

  10. 25 ml ? calibration

  11. This is a quadruple beam balance

  12. What’s the calibration? 0.01 gram

  13. This is a buret ? calibration 0.1 ml Note: unlike graduated cylinder, numbers go down, so you read downwards

  14. Temperature Scales

  15. Scientifically speaking … The definition of temperature: Temperature ismeasure ofaveragekinetic energy of particles in system

  16. World’s Record Cold Temperatures Date ˚F ˚C World (Antarctica): Vostok II 7/21/1983 –129 –89 Verkhoyansk, Russia (Siberia) 2/7/1892 –94 –70 Asia: Oimekon, Russia 2/6/1933 –90 –68 Greenland: Northice 1/9/1954 –87 –66 No A: Snag, Yukon, Canada 2/3/1947 –81 –63 US: Prospect Creek, Alaska 1/23/1971 –80 –62 US: (other than AK) Rogers Pass, Mont. 1/20/1954 –70 –56.5

  17. Conversion formulas How can we convert from one temperature scale to another? K = °C + 273 (more precisely 273.15) °C = K – 273 [F = (9/5 °C) + 32]

  18. Errors are inevitable and need to be dealt with …

  19. Percent Error Ratio of error to accepted value % error = Error x 100% acceptedvalue

  20. accepted value absolute value: always positive Error measured value – accepted value x100%

  21. Student A (g/cm3) Student B (g/cm3) Student C (g/cm3) Trial 1 1.54 1.40 1.70 Trial 2 1.60 1.68 1.69 Trial 3 1.57 1.45 1.71 Data table Students asked to find density of sucrose [Sucrose has density of 1.59 g/cm3]

  22. Student A (g/cm3) Student B (g/cm3) Student C (g/cm3) Trial 1 0.05 0.19 0.11 Trial 2 0.01 0.09 0.10 Trial 3 0.02 0.14 0.12 Remember, error is always positive number Let’s calculate the error

  23. Student A % error Student B error Student C error Trial 1 3.14 11.9 6.9 Trial 2 0.63 5.7 6.3 Trial 3 1.26 8.8 7.5 Now let’s calculate % error

  24. Advantage of % Error • easier to compare data, especially if comparing data from different trials

More Related