Units of Measurements and Uncertainty

1. Units of Measurements and Uncertainty Objectives: • 1. Identify the metric units of measurement for length, mass, and volume. • 2. List the common metric prefixes and demonstrate how metric prefixes can be used to change units • 3. Explain why measuring always involves estimation. • 4. Describe two causes of uncertainty in measurements. • 5. Explain the difference between accuracy and precision. Key Terms: metric system, International System of Units (SI), base unit, mass, derived unit, volume, metric prefix, precision, accepted value, accuracy

2. Measurements are required for scientific inquiry. In order to have meaning a unit must be attached to the measurement. Throughout the different scientific disciplines you will find the use of the metric system. Becoming familiar with the standard prefixes will make solving equations and converting units easier.

3. Metric Prefixes

4. SI UnitsThe units used in science are those primarily used throughout the world. The International System of Units (SI) is a system based on the metric system. There are 7 fundamental units of measure

5. English to Metric Conversions:

6. Other SI units derived from the base units

7. Some commonly used values in science.