1. Units and Standards

2. In science, numbers arent just numbers. They need a unit. We use standards for this unit. A standard is: a basis for comparison a reference point against which other things can be evaluated Ex. Meter, second, degree

3. Units and Standards The unit of a #, tells us what standard to use. Two most common system: English system Metric system The science world agreed to use the International System (SI) Based upon the metric system.

4. Units and Standards

5. Conversions in the SI are easy because everything is based on powers of 10

6. Units and Standards Ex. Length. Base unit is meter.