Williams J. Defining and Measuring Nature...2ed 2020

Textbook in PDF format

Measurement forms an essential part of our view of the world. Our world is measured and calibrated, and we are all subject to the tyranny of these numbers. In this updated and extended edition, the author outlines the history of measurement; particularly of the International System of units (SI). Since the previous edition, the base units of the SI have been redefined; realising a 150-year-old dream for a measurement system based on unchanging, fundamental quantities of Nature. This change has created a new SI, a Quantum-SI, which will significantly change the way we look at Nature in a quantitative manner, and greatly facilitate the advance of science. Key Features Significantly updated and extended new edition of a popular book The first book including the new quantum SI base units definitions Features wider societal and philosophical implications of a move away from physical standards Outlines the history of the science of measurement, and the origin of the Metric System More than a textbook of metrology, It is also a history of how we have arrived at the Quantum-SI