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Uncertainty in Measurement Precision: how close together the measurements are to one another Accuracy: How close to the true value.

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Presentation on theme: "Uncertainty in Measurement Precision: how close together the measurements are to one another Accuracy: How close to the true value."— Presentation transcript:

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2 Uncertainty in Measurement Precision: how close together the measurements are to one another Accuracy: How close to the true value

3 Significant Figures -Sig. Figs tell the reader how precise the measurements were taken Whats Significant? 1.All non-zero digits (1,2,3,etc.) 2. All Zeros appearing in between non-zero digits (101,102, etc.) 3. Zeros that appear in front of non-zero digits are NOT significant Example: x (only one sig fig)

4 Sig fig rules 4. Zeros at the end of a number and RIGHT of the decimal place ARE significant Example: (3 sig figs) 5. Zeros to the right of a number are not significant, Unless there is a decimal point Ex sig figs however: Now has 4 sig figs

5 How many significant figures in each 314________ 60________ ______ 100________ 500.0_______ ______ _______ 1.32 x 10 5 ______

6 More Examples Indicate the number of significant figures ______________ _____________ ____________ _____________ ______________ _____________ ___________ ____________ _____________ _____________ _________ ______________ __________ __________ ____________ _________ x 10 4 __________ x _________

7 Significant Figures in Calculations Multiplication/Division The answer can have no more significant figures than there and in the measurement with the smallest number of Sig. Figs. Ex x 3.0 = 51.6 (3) (2) Therefore have to round to 2 sig figs 52 Solve and answer with the correct number of sig figs x 0.3__________ / 10____________ / 10.__________ / 10.0___________ x 2.00_________ x 10 2 /189__________

8 Addition / Subtraction Answer can have no more decimal places than there are in the smallest measurements. (# To the right of the decimal) Ex In addition / subtraction we can gain or lose sig. Figs = 100 (2) (2) (1)


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