The Scientific Method 1

Using and Expressing Measurements Scientific notation is written as a number between 1 and 10 multiplied by 10 raised to a power. 2

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. 3

Accuracy, Precision, and Error 4

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. ( has 2 sig figs) 5

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) 6

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 7

Measuring with SI Units 8

Units and Quantities 9

10

Units and Quantities 11

Units and Quantities 12