1 / 27

Measuring

Measuring. Accuracy v. Precision pg. 8. Precision - how closely the measurements match each other. Instruments that measure using more decimals are more precise. Accuracy – how closely the measurement matches the true or accepted value. Accurate. Precise. Accurate. Precise. Accurate.

lee
Download Presentation

Measuring

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. Measuring

  2. Accuracy v. Precision pg. 8 Precision - how closely the measurements match each other. Instruments that measure using more decimals are more precise. Accuracy – how closely the measurement matches the true or accepted value.

  3. Accurate Precise

  4. Accurate • Precise

  5. Accurate • Precise

  6. Accurate • Precise

  7. Accurate • Precise

  8. How To Read Scientific Instruments • 1) Record the _______ digit on the instrument. • 2) Then _______________ the last digit.

  9. Significant Figures Measuring devices are not perfect. Human measurements always have a small degree of uncertainty All digits known for certain plus the last digit which is an estimation. Each digit in the measurement is called a significant figure.

  10. How to Read a Graduated Cylinder • Sit the graduated cylinder on a level surface. • Lower your eyes to the level of the liquid (called the meniscus). • Take your reading from the bottom of the meniscus. • Count all of the digits you are sure of. • Add the last digit that you estimate.

  11. Quiz page13 • Number your paper 1 to 15.

  12. 1) Measuring Length 2 cm 19 cm 1.95 cm 1.95238 cm

  13. 2) Measuring Length • 10cm • 1.1cm • 1.05cm • 1.526cm

  14. 3) Measuring Length • 17 cm • 17.5 cm • 18.0 cm • 17.5082 cm

  15. 4) Measuring Length • 4cm • 4.3cm • 4.30cm • 4.3057cm

  16. 5) Measuring Length • 12 cm • 12.0 cm • 12.7 cm • 12.0953 cm

  17. 6) Measuring Liquids • The meniscus is the curve in the upper surface of a liquid close to the surface of the container or another object, caused by surface tension. It can be either convex or concave. Is this meniscus convex or concave? 6) _________________ For questions 7 to 12, measure the amount of liquid in each graduated cylinder by reading the bottom of the meniscus.

  18. 7) Measuring Liquid Volume • 10ml • 10.3ml • 11.5ml • 13.0ml

  19. 8) Measuring Liquid Volume • 266 ml • 287 ml • 290 ml • 294 ml

  20. 9) Measuring Liquid Volume • 52 ml • 53 ml • 54.5 ml • 52.8 ml

  21. 10) Measuring Liquid Volume • 80 ml • 80.0 ml • 81.0 ml • 79.0 ml

  22. 11) Measuring Liquid Volume • 2.8 ml • 2.80 ml • 2.90 ml • 2.9 ml

  23. 12) Choose the correct answer. • Amelia measured the amount of liquid her thimble would hold. She wrote down three numbers: 4.4ml, 4.3ml and 4.5ml. Pick the letter that best describes her measurements based on the actual amount of liquid shown in the graduated cylinder. • Accurate • Precise • Both Accurate and Precise • Neither Accurate nor Precise

  24. 13) Measuring Solids • 625.62g • 26.57g • 265.73 • 526.6g

  25. 14) Measuring Solids • 373.33g • 734.33g • 374.33g • 373.3g

  26. 15) Measuring Solids • 222.50g • 221.50g • 221.5g • 221.0g

  27. Answers to Quiz • C 1.95cm • C 1.05cm • B 17.5cm • C 4.30cm • B 12.0cm • Concave • C 11.5ml • D 294ml • D 52.8ml • B 80.0ml • B 2.80ml • B Precise • C 265.73g • A 373.33g • B 221.50g

More Related