A. 3 Parts to any measurement 1. Numerical Value 2. Unit (denotes scale) 3. Estimate of uncertainty B. Lab Measurement-proper number of sig figs 1. Sig.

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A. 3 Parts to any measurement 1. Numerical Value 2. Unit (denotes scale) 3. Estimate of uncertainty B. Lab Measurement-proper number of sig figs 1. Sig figs depend upon instrument a) Definitely known scale, divisions plus one estimated “doubtful” digit b) Last digit is estimate, represents uncertainty c) ALWAYS estimate to one place beyond smallest scale division d) Measurement limited by uncertainty (more digits does not mean more precise!)

C. Precision and Accuracy 1. Accuracy-most known true value 2. Precision-limited by uncertainty of measuring device D. Experimental Error 1. NOT from careless mistakes or error in procedure! 2. Unavoidable-always consider sources and magnitude.