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02Post - SUSB-003 BACKGROUND Measuring devices have...

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1 Introduction to Laboratory Measurement SUSB-003 SUSB SUSB-003 003 Last Updated: 9/2/2009 Measuring devices have intrinsic uncertainty i.e., limitations due to their design/construction BACKGROUND Measurement process itself may introduce additional uncertainty Measurer usually plays a role in the measurement Uncertainty process In chemistry, certain quantities are often chosen as fundamental : m ass, t ime length (area, volume), Many measuring devices are constructed so as to be LINEAR RULE OF THUMB: On a LINEAR SCALE LINEAR SCALE , human eye is capable of estimating the location of a mark lying between two smallest divisions to the nearest 1/5 th of a division Linear/Rule What distinguishes scientific computation from arithmetic primarily is that most scientific numbers include units . PROCEDURE 1. Measure Diameter of Plastic Sphere 2. Weigh Plastic Sphere using two types of balance 3. Compute Density of Sphere using above two results & examine uncertainty 4. Direct Measurement of Liquid Volumes 5. Record weight of a penny Procedure 1. Measure DIAMETER, d From that, compute AREA and VOLUME of a SPHERE from the known mathematical relationships to the diameter. A = π d 2 V = π d 3 / 6 Purpose : To explore error propagation in quantities derived from diameter Cube I.e., suppose we make a small error in measuring d. How large an error will that produce in A and V ?
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