1

The Scientific Method

2

Using and Expressing Measurements

Scientific notation is written as a number between 1 and 10 multiplied by 10 raised to a power.

3

Accuracy, Precision, and Error

Accuracy is how close a measurement is to the actual or true value of whatever is measured.

Precision is how close a series of measurements are to one another.

4

Accuracy, Precision, and Error

5

Significant Figures in Measurements

1. Every nonzero digit is significant. (1.48 has 3 sig figs)

2. Zeros between nonzero digits are significant. (10605 has 5 sig figs)

3. Zeros appearing before nonzero digits are not significant. (0.00034 has 2 sig figs)

6

Significant Figures in Measurements

4. Zeros at the end of a number to the right of a decimal place are always significant. (12.00 has 4 sig figs)

5. Zeros at the end of a number without a decimal are not significant. (12500 has 3 sig figs)

7

Significant Figures in Calculations

Addition and Subtraction: the answer has the same number of decimal places as the measurement with the least number of decimal places.

Multiplication and Division: the answer has the same number of significant figures as the measurement with the least sig figs

8

Measuring with SI Units

9

Units and Quantities

10

Units and Quantities

11

Units and Quantities

12

Units and Quantities