## Chapter 1

Chapter 1.3 (Pages 8-10) SI system- International System of units. Based on/ Derived from metric system. Quantitative Observation- Measurement Consists of a number and a scale (unit) Mass- Measure of resistance of an object to a change in its state of motion Weight- Force gravity exerts on an object Chapter 1.4-1.5 (pages 11-18) Uncertainty- Estimated number in a measurement A measurement always has some degree of uncertainty Assumed to be +/- 1 unless otherwise indicated Precision- the degree of agreement among several measurements of the same quantity (reproducibility) Accuracy- Agreement of a particular value with the true value Errors: