By L. Kirkup, R. B. Frenkel
Size shapes clinical theories, characterises advancements in production tactics and promotes effective trade. In live performance with dimension is uncertainty, and scholars in technology and engineering have to establish and quantify uncertainties within the measurements they make. This publication introduces dimension and uncertainty to moment and 3rd yr scholars of technology and engineering. Its procedure will depend on the the world over recognized and advised directions for calculating and expressing uncertainty (known via the acronym GUM). The information underpinning the tools are thought of and labored examples and routines are unfold through the textual content. particular case reviews according to normal undergraduate experiments are incorporated to augment the rules defined within the ebook. This consultant can be valuable to pros 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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Additional resources for An introduction to uncertainty in measurement using the GUM
For example, the electrical resistance of a conducting material varies with temperature. To measure its temperature coefﬁcient of resistance, we measure the resistance at intentionally different temperatures. 2). 1. Random errors when measuring the temperature coefﬁcient of a resistor (courtesy of the National Measurement Institute of Australia). the distribution of temperature over its surface to be as uniform as possible. It is therefore immersed in a tank of stirred oil that can be set to various temperatures.
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. We note that high accuracy implies high precision, but the reverse does not hold: high precision does not imply high accuracy if there exists a signiﬁcant systematic error.
1 Measurement and related terms 33 Pursuing the example of the timing of a falling object a little further, it is possible that the stopwatch has developed a minor fault such that it consistently indicates that the time of fall is slightly greater than the true value. 2), would be consistently positive. This type of error is referred to as systematic, since it causes all measured values to be consistently under- or over-estimated. To a greater or lesser degree, random and systematic sources of error affect all measurements, but whether it is random or systematic errors that dominate in any given situation is sometimes difﬁcult to establish.
An introduction to uncertainty in measurement using the GUM by L. Kirkup, R. B. Frenkel