Mr. Chapman Chemistry 20. Accuracy, Precision, And Significant Figures. Accuracy and Precision. It is important to note that accuracy and precision are NOT the same thing. Data can be very accurate, but not precise. Data can be very precise, but not accurate.
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If your instrument measures in "1"s then any value between 6.5 and 7.4 is measured as "7"
If your instrument measures in "2"s then any value between 7 and 9 is measured as "8"
Ex: The number 2134 has 4 significant figures.
Ex: The number 2004 has 4 significant figures.
Ex: The number 0.046 has 2 significant figures.
Ex: The number 5000 has only 1 significant figure.
Ex: The number 7.9100 has 5 significant figures.
Try these examples, young chemists:
188,784 cm3 which we round to 190,000 cm3 (2 significant rigures)
86.257 mL =
255.607 mL which we round to 255.6 mL.
Conversion factors are considered to have an INFINITE number of significant figures