Joule perceived the relationship between his discoveries and the kinetic theory of heat. Wikisource has original works written by or about: The British government appointed Joule a life pension of pounds sterling for his work and achievements. He spent his childhood in poverty in the slums of Harlem and at the Joule became a widower when she died in , 7 years after their wedding. In the search for simple physical laws, Joule necessarily relied on theoretical representations.

His joint work with William Thomson led to an outstanding discovery, known as the Joule-Thomson effect. Please note that our editors may make some formatting changes or correct spelling or grammatical errors, and may also contact you if any clarifications are needed. His views embodied then-current ideas about the electric nature of the chemical forces and the electrodynamic origin of magnetization, as well as the concept of heat as a manifestation of vibratory motions on the atomic scale. The unit of energy in the international system is named after Joule. In Joule and William Thomson later Lord Kelvin discovered that when a gas is allowed to expand without performing external work, the temperature of the gas falls.

James Prescott Joule – Wikipedia

His work established the mechanical theory of heatand he was the first to determine the relationship between heat energy and mechanical energy the mechanical equivalent of heat. Joule’s experiments complemented the theoretical work jamez Rudolf Clausiuswho is considered by some to be the coinventor of the energy concept.

Thus Joule’s estimate was 4. Joule’s study of the interrelation of heat and electrical energy may have stimulated his study of the relationship between heat and mechanical work. Contact our editors with your feedback.

Joule, James Prescott

Wikimedia Commons has media related to: Copyright The Columbia University Press. Joule was undaunted and started to seek a purely mechanical demonstration of the jamed of work into heat. The founder of statistical physics and classical electrodynamics He said that during the experiment, the mechanical energy is converted into heat.

However, Joule’s interest diverted from the narrow financial question to that of how much work could be extracted from a given source, leading him to speculate about the convertibility of energy. Sale, England, 11 October John Dalton John Davies. Marital enthusiasm notwithstanding, Joule and Thomson arranged to attempt an experiment a few days later to measure the temperature difference between the top and bottom of the Cascade de Sallanches waterfall, though this subsequently proved impractical.


In particular, he reported his final determinations of the equivalent to the French Academy of Sciences, and presented this learned body with the iron paddle-wheel jouls he had used in the case of mercury.

essay on james prescott joule

Also inanother of Joule’s presentations at the British Association in Oxford was attended by George Gabriel StokesMichael Faradayand the precocious and maverick William Thomsonlater to become Jouoe Kelvin, who had just been appointed professor of natural philosophy at the University of Glasgow. James Prescott Jouleborn December 24,SalfordLancashire [now in Greater Manchester], England—died October 11,Sale, CheshireEnglish physicist who established that the various forms of energy—mechanical, electrical, and heat—are basically the same and can be changed one into another.

Together with Thomson, Joule also worked on an absolute thermodynamic scale, which is known as the Kelvin temperature scale, named after William Thomson, who wore the title of Lord Kelvin.

James Prescott Joule |

During the decadehe displayed the powerful creative activity that led him to the recognition of the general law of energy conservation and the establishment of the dynamical nature of heat.

On presctot basis of these scientific studies, Joule formulated his first law, which deals with the interaction of the passage of electric current through a conductor and a certain amount of heat released as a result of this. Joule presented the results of these mechanical work experiments in a paper, “On the Calorific Effects of Magneto-electricity and on the Mechanical Value of Heat,” which he read at the meeting of the British Association inbut no notice was taken of them.

Joule investigated the quantitative relationship between electric currents and heat during the s and formulated the theory of the heating effects that accompany the flow of electricity in conductors.


essay on james prescott joule

His unique achievements in the energy industry and its aspects are still the basis for many researchers. We find the first explicit mention of these in the Victoria Gallery lecture, where Joule operated with a crude, but quite effective, atomistic picture of matter.

He realized their significance, and through his efforts Joule finally got an attentive hearing of his work inwhen his paper “On the Mechanical Equivalent jaames Heat” was read to, and accepted for publication by, the Royal Society.

Development of the concept of energy thermoelectric theory In electromagnetism: Moreover, by studying the heating effects of the induced current, to which a voltaic one was added or subtracted, he established, by a remarkably rigorous argument, the strict equivalence of the heat produced on revolving the coil and the mechanical work spent in the operation. Keep Exploring Britannica Leonardo da Vinci.

Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Our editors will review what you’ve submitted, and if it meets our criteria, we’ll add it kn the article. Lavoisier’s prestige and the practical success of Sadi Carnot ‘s caloric theory of the heat engine since ensured that the young Joule, working outside either academia or the engineering profession, had a difficult road ahead.

Joule, James Prescott b.

James Prescott Joule

Though both men had been neglected since their respective publications, Helmholtz’s definitive declaration of the conservation of energy credited them both. Regarding the nature of heat, no conclusion could be derived from the phenomena of the voltaic circuit: Then, copy and paste the text into your bibliography or works cited list. Donald Stephen LowellJames P.