1. Standards of Measurement
Chapter 1 Section 2

2. Precision and Accuracy
Precision describes how close measurements are to each other.
Accuracy compares a measurement to the real or accepted value.

3. Is it Accurate or Precise?

4. Precise, because the targets are next to each other, but not in the center.

5. Is this Accurate or Precise?

6. Accurate, because it is close to the bulls-eye, but not close to each other.

7. International System of Units
Developed in the 1960’s
Metric System
Based on units of 10

8. SI Prefixes
Turn to page 15 of your text book

9. Measuring Distance