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The fascinating stories behind the essential seven units of measurement that allow us to understand the physical world From the beginning of history, measurement has been interwoven into the human experience, shaping our understanding of nature, personal relationships, and the supernatural. We measure the world to know our past, comprehend the present, and plan the future. Renowned physicist Piero Martin explores how scientific knowledge is built around seven key pillars of measurement: the meter for length; the second for time; the kilogram for mass; the kelvin for temperature; the ampere for electricity; the mole for quantity of substance; and the candela for luminous intensity. Martin examines the history and function of these units and illustrates their applications in rich vignettes on topics ranging from quarks and black holes to coffee and beer. He delves into not only the all-important numbers but also anecdotes that underline each unit’s special quality. At the same time, he explains how each unit contributes to important aspects of science, from classical physics to quantum mechanics, from relativity to chemistry, from cosmology to elementary particle physics, and from medicine to modern technology. Martin eloquently shows how the entire universe can be measured and understood using just a few units.
Metric system --- Metrology --- Units of measurement --- History. --- Science --- Weights And Measures
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L’homme a toujours mesuré le monde, pour mieux l’appréhender et l’explorer, y vivre et interagir avec ses semblables. Mais il lui a fallu inventer un système valable pour tous. C’est à Paris, en 1960 et 1971, qu’ont été définies sept unités de mesure fondamentales – le mètre, la seconde, le kilogramme, le kelvin, l'ampère, la mole et la candela – grâce auxquelles nous quantifions tout, de l’infiniment petit à l’infiniment grand. En sept chapitres remplis d’anecdotes, c’est toute l’histoire de cette fascinante aventure scientifique qui défile sous nos yeux, des théories d’Einstein à la haute technologie numérique. Et demain ? Gageons que la science des mesures, désormais fondée sur des constantes immuables comme la vitesse de la lumière, nous aidera à bâtir un avenir durable et respectueux de l'environnement.
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