Significant Figures Overview

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Presentation transcript:

Significant Figures Overview Physics

Applying Precision - Accuracy Scientists use significant figures to show precision of a measured quantity Significant figure: Prescribed decimal place determining the amount of rounding-off when assessing the precision of a measurement Round your answers to the correct significant figures

Significant Figures – Counting Rules ALL non-zero digits are Significant Leading and trailing zeros are not significant 2500 and 0.000036 have TWO Significant Figures Zeros in between Non-Zeros are significant 2501 and 2003 have FOUR Significant Figures Zeros after a decimal point ARE SIGNIFICANT They do not begin the number 25.00 and 15.10 have FOUR Significant Figures

Significant Figures – Adding/Subtracting The answer cannot have more decimal places than the least number of decimal places in the calculation Add 15.1 to 3 The answer is 18

Significant Figures – Multiplication/Division Based on the givens or what you think are measured values, round your answer so that it has the same number of significant figures as the input ( or given ) with the fewest number of significant figures Multiply 2.0 and 3.01 Answer in correct significant figures is 6.0