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James Clerk Maxwell

James Clerk Maxwell
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Overview

James Clerk Maxwell (13 June 1831 – 5 November 1879) was a Scottish physicist and mathematician who was responsible for the classical theory of electromagnetic radiation, which was the first theory to describe electricity, magnetism and light as different manifestations of the same phenomenon. Maxwell's equations for electromagnetism achieved the second great unification in physics, where the first one had been realised by Isaac Newton. Maxwell was also key in the creation of statistical mechanics.

Maxwell graduated from Trinity College, Cambridge, in 1854, where he earned distinction in mathematics and the Smith's Prize. He remained at Cambridge briefly, publishing early mathematical work and investigations into optics, particularly the principles of colour combination and colour-blindness. He later held the Chair of Natural Philosophy at Marischal College in Aberdeen, where he studied the rings of Saturn and correctly proposed that they were composed of numerous small particles, work that earned him the Adams Prize in 1859. During this time he married Katherine Mary Dewar, who assisted him in his laboratory work. From 1860 to 1865, he served as the Professor of Natural Philosophy at King's College London, where he developed his theory of electromagnetic fields. His publication of "A Dynamical Theory of the Electromagnetic Field" in 1865 demonstrated that electric and magnetic fields travel through space as waves moving at the speed of light, proposing that light is an undulation in the same medium that is the cause of electric and magnetic phenomena. His unification of light and electrical phenomena led to his prediction of the existence of radio waves.

Maxwell was the first to derive the Maxwell–Boltzmann distribution, a statistical means of describing aspects of the kinetic theory of gases, which he worked on sporadically throughout his career. He presented the first durable colour photograph in 1861, and showed that any colour can be produced with a mixture of any three primary colours, those being red, green, and blue, the basis for colour television. He worked on analysing the rigidity of rod-and-joint frameworks (trusses) like those in many bridges. He devised modern dimensional analysis and helped to establish the CGS system of measurement. He was the first to recognize chaos, and the first to emphasize the butterfly effect. His 1863 paper On Governors serves as an important foundation for control theory and cybernetics, and was also the earliest mathematical analysis on control systems. In 1867, he proposed the thought experiment known as Maxwell's demon, which challenges how information affects entropy in thermodynamics. In his seminal 1867 paper On the Dynamical Theory of Gases he introduced the Maxwell model for describing the behavior of a viscoelastic material and originated the Maxwell-Cattaneo equation for describing the transport of heat in a medium.

In 1871, Maxwell returned to Cambridge as the first Cavendish Professor of Physics, overseeing the construction of the Cavendish Laboratory. As a result of his work he is regarded as a founder of the modern field of electrical engineering. His discoveries helped usher in the era of modern physics, laying the foundations for such fields as relativity, also being the one to introduce the term into physics, and quantum mechanics.

Overview adapted from Wikipedia (CC BY-SA 4.0; see the article history for authors).

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  1. They specially called attention to the fact that _polarity_, that is, the sundering of a force into two qualitatively different and opposed activities striving after reunion, which also shows itself for the most part in space as a dispersion in opposite directions, is a fundamental type of almost all the phenomena of nature, from the magnet and the crystal to man himself. Yet this knowledge has been current in China…

    Arthur Schopenhauer, The World as Will and Idea

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  2. The seventeenth century exhibits another example of this same danger; and, of all people in the world, Newton fell into it. Huyghens had produced the wave theory of light. But this theory failed to account for the most obvious facts about light as in our ordinary experience, namely, that shadows cast by obstructing objects are defined by rectilinear rays. Accordingly, Newton rejected this theory and adopted the…

    Alfred North Whitehead, Science and the modern world

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  3. I then proceed to examine those factors in nature which lead us to conceive nature as occupying space and persisting through time. This procedure has led us to an investigation of the characters of space and time. It results from these investigations that the formulae of the third case and the orthodox formulae are on a level as possible formulae resulting from the basic character of our knowledge of nature. The…

    Alfred North Whitehead, The Concept of Nature The Tarner Lectures Delivered in Trinity College, November 1919

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