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Thermodynamics is the branch of physics that deals with heat and temperature, and their relation to energy, work, radiation, and properties of matter. Scots-Irish physicist Lord Kelvin was the first to formulate a concise definition of thermodynamics in 1854 which stated, "Thermo-dynamics is the subject of the relation of heat to forces acting between contiguous parts of bodies, and the relation of heat to electrical agency.


How can one interprets temperature in vacuum? As by definition temperature is the average kinetic energy of the molecules or so and in vacuum there is no such collision takes place as no particles (considering nothing inside) so how can one interprets temperature inside a vacuum?

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