1. Section 5.1 Scientific Notation and Units 1.To show how very large or very small numbers can be expressed in scientific notation 2.To learn the English, metric, and SI systems of measurement 3.To use the metric system to measure length, volume and mass Objectives

2. Section 5.1 Scientific Notation and Units Measurement A quantitative observation Consists of 2 parts –Number –Unit – tells the scale being used

3. Section 5.1 Scientific Notation and Units A. Scientific Notation Very large or very small numbers can be expressed using scientific notation –The number is written as a number between 1 and 10 multiplied by 10 raised to a power. –The power of 10 depends on: The number of places the decimal point is moved. The direction the decimal point is moved. Left  Positive exponent Right  Negative exponent

4. Section 5.1 Scientific Notation and Units A. Scientific Notation Representing Large Numbers Representing Small Numbers 0.000167To obtain a number between 1 and 10 we must move the decimal point. 0.000167 = 1.67  10 -4

5. Section 5.1 Scientific Notation and Units B. Units Units provide a scale on which to represent the results of a measurement.

6. Section 5.1 Scientific Notation and Units B. Units There are 3 commonly used unit systems. –English (used in the United States) –Metric (uses prefixes to change the size of the unit) –SI (uses prefixes to change the size of the unit)

7. Section 5.1 Scientific Notation and Units C. Measurements of Length, Volume and Mass Length –Fundamental unit is meter –1 meter = 39.37 inches Comparing English and metric systems

8. Section 5.1 Scientific Notation and Units C. Measurements of Length, Volume and Mass

9. Section 5.1 Scientific Notation and Units C. Measurements of Length, Volume and Mass Volume –Amount of 3-D space occupied by a substance –Fundamental unit is meter 3 (m 3 )

10. Section 5.1 Scientific Notation and Units C. Measurements of Length, Volume and Mass Mass –Quantity of matter in an object –Fundamental unit is kilogram

11. Section 5.1 Scientific Notation and Units C. Measurements of Length, Volume and Mass