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# Ch.3 Notes - Which units English or metric o Common vs...

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Which units, English or metric o Common vs. Science o Know conversions Fundamental Units: SI units (1960) o See table 3.1 o Ex. length meter; mass kilogram; temperature Kelvin Derived Units: defined by base SI units o Ex. area meter 2 (m 2 ); l x w= area Problem: units are cumbersome to use, so… o Know metric prefixes Accuracy vs. Precision Accuracy o Closeness of a measurement to a true value Precision o Closeness of a group of measurements Precision and significant figures in measurements o Recorded measurement should reflect the precision with which the measurement was performed, it should contain the proper number of significant digits Precision o Fineness or reproducibility of a measurement Depends on the instrument and skill of operator Indicated by significant figures Significant figures o Reliable or meaningful digits in a measurement: the last digit is estimated Accuracy o

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Ch.3 Notes - Which units English or metric o Common vs...

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