1 / 16

The International System of Units (SI )

SI Measurement System. The International System of Units (SI ). The International System of Units (SI) is a system of units of measurement consisting of seven base units Mostly widely used system of measurement

bryga
Download Presentation

The International System of Units (SI )

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. SI Measurement System The International System of Units (SI) • The International System of Units (SI) is a system of units of measurement consisting of seven base units • Mostly widely used system of measurement • The United States is the only industrialized nation that has not adopted the SI system

  2. The International System of Units • Often referred to as the metric scale • Prefixes indicate an integer power of 10

  3. Common Items: Size Comparison

  4. Recording Measurements • A measurement always includes a value • A measurement always includes units • A measurement always involves uncertainty • A measurement is the best estimate of a quantity

  5. Significant Digits Scientists and engineers often use significant digits to indicate the uncertainty of a measurement • Significant digits are digits in a decimal number that carry meaning indicating the certainty of the value • All digits you record for a measurement are considered significant • Include all certain digits in a measurement and one uncertain or estimated digit

  6. Significant Digits • General Rules • Digital Instruments – Read and record all digits, including zeros after the decimal point, exactly as displayed • Decimal Scaled Instruments – Record all digits that you can certainly determine from the scale markings and estimate one more digit

  7. Metric Scale • A typical metric scale often includes a30+ centimeter graduated scale • Each centimeter is graduated into 10 millimeters

  8. The Millimeter • The millimeter is the smallest increment found on a typical metric scale 1 mm

  9. The Millimeter • The next larger marking on a metric scale shows 5 millimeters 5 mm

  10. The Millimeter • Largest markings on a metric scale represent centimeters (cm) • These are the only marks that are actually numbered 1 cm = 10 mm

  11. Measurement: Using a Decimal Scale • How long is the rectangle? • Let’s look a little closer

  12. Measurement: Using a Decimal Scale • How long is the rectangle?

  13. Recording a Measurement • How long is the rectangle? • Remember the general rule • Decimal Scaled Instruments – Record all digits that you can certainly determine from the scale markings and estimate one more digit Best Estimate = 3.84 cm

  14. Recording a Measurement • How long is the rectangle? • Remember the general rule • Decimal Scaled Instruments – Record all digits that you can certainly determine from the scale markings and estimate one more digit Best Estimate = 3.84 cm Certain

  15. Your Turn • How would you record the length of this rectangle? • How many significant digits? 6.33 cm 3

  16. Your Turn Record each measurement in centimeters using the appropriate number of significant digits.

More Related