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By L. Kirkup, R. B. Frenkel

Dimension shapes clinical theories, characterises advancements in production tactics and promotes effective trade. In live performance with size is uncertainty, and scholars in technology and engineering have to establish and quantify uncertainties within the measurements they make. This booklet introduces dimension and uncertainty to moment and 3rd 12 months scholars of technology and engineering. Its method depends upon the the world over regarded and advised directions for calculating and expressing uncertainty (known through the acronym GUM). The facts underpinning the tools are thought of and labored examples and routines are unfold in the course of the textual content. specified case reviews in response to average undergraduate experiments are incorporated to augment the rules defined within the e-book. This consultant can be worthy to execs in who're anticipated to grasp the modern tools during this more and more vital region. extra on-line assets can be found to aid the booklet at www.cambridge.org/9780521605793.

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When values obtained by repeat measurements of a particular quantity exhibit little variability, we say that those values are precise. Precision, like accuracy, is a qualitative term. It is used to convey a sense of the scatter of values when repeat measurements of a particular quantity are made. Values that exhibit little scatter may, owing to the influence of systematic error, be far from the true value. Care must be exercised when measurements are precise since, if a systematic error has not been accounted for, all the values could be misleading.

15 K Where there are several steps in a calculation, it is prudent not to round intermediate results, since premature rounding introduces unnecessary error that will propagate through to the final answer. If in doubt, use all the figures available at each step in a calculation. Once the final answer has been obtained, review the calculations to determine which values are given to the least number of significant figures, then round accordingly. 3. When very accurate measurements are made, the uncertainties may be expressed in parts per million or even parts per billion.

6 Value The process of measurement yields a value of a particular quantity. 44 g. A value may be regarded as the product of a number and the unit in which the particular quantity is measured. 7 The true value and best estimate of the true value Through careful measurement we seek to estimate the true value of a quantity. An experiment might be devised to find the amount of charge carried by an electron. 32 Terms used in measurement Evidence indicates that every electron carries the same amount of charge – but what is its value?

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