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Physics so follows this principle: since the fall of a glass of a table to the increased volume of milk during boiling. There are chemical processes in the system absorbs heat, but its pressure is kept constant. The heat absorbed by a constant pressure system is represented in a special manner, is called enthalpy change (H) system. IsolatingQ in equation (3) we can write the enthalpy by the equation (4): The enthalpy definitionbecomes important in many chemical reactions that occur at constant pressure. Through the concept of enthalpy we can associate the heat energy absorbed in a reaction that occurs at constant pressure. DEBATE The moment you set about writing his theory of heat, felt some difficulty? Received criticism from his colleagues? Note that in the midst of difficulties, throughout history, there was the development of a concept of heat, currently accepted as scientific. Given the discussions made throughout the text, as you face their conceptions about heat? Consequences of the idea of the heat energy The idea of heat energy does not stop here, for just taking part in another case that sparked a revolution in the history of science. At the time of the second industrial revolution (second half of the nineteenth century), the temperature control in the production of steel was of great importance in view of the desired quality for such a product. This control was hampered by the high temperatures involved, which invisibilized using conventional thermometers. Then came the need to find a new parameter on the energy of these bodies serve as the basis for the measurement of temperatures. When an object is at a very high temperature, manifests a certain glow, a glow, is the case of the incandescent lamp, the embers of the fire and the sun was already known that one of the forms of heat transfer is radiation, so sought is a scientific explanation that could give an idea of the amount of energy released by a heated body, the so-called thermal radiation, for example, in production of steel. Source: http://imag.search.com
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Fizika pa slijedi ovaj princip: od pada čašu na stol na povećane količine mlijeka tijekom ključanja. Tu su kemijski procesi u sustavu apsorbira toplinu, ali je njezin tlak ostaje konstantna. Vrućina apsorbira konstantan tlak sustava je zastupljena na poseban način, naziva se entalpija promjena ( H) sustava. Izoliranje P u jednadžbi (3) možemo napisati entalpija strane jednadžbe (4): The entalpije definicijapostaje važno u mnogim kemijskim reakcijama koje se odvijaju pri stalnom tlaku. Kroz koncept entalpije možemo povezati toplinske energije apsorbira u reakciji koja se javlja pri stalnom tlaku. DEBATA U trenutku kada je krenula pisati svoju teoriju topline, osjetio neke poteškoće? Dobio kritike od svojih kolega? Imajte na umu da i usred teškoća, tijekom povijesti, bilo je razvoj koncepta topline, trenutno je prihvaćen kao znanstvena. S obzirom na razgovore u cijelom tekstu, kao što se suoče sa svojim promišljanjima o topline? Posljedice ideji toplinske energije Ideja toplinske energije ne prestaje ovdje, za samo sudjelovanje u drugom slučaju koji je izazvao revoluciju u povijesti znanosti. U vrijeme druge industrijske revolucije (druga polovina XIX stoljeća), kontrolu temperature u proizvodnji čelika bio je od velike važnosti s obzirom na željenu kvalitetu za takav proizvod. Ova kontrola je otežan zbog visoke temperature, koje su uključeni invisibilized korištenjem konvencionalnih toplomjera. Onda je došao potrebno pronaći novi parametar na energiji tih tijela služe kao osnova za mjerenje temperature. Kada je objekt na vrlo visokoj temperaturi, pokazuje određeni sjaj, sjaj, što je slučaj od žarulja sa žarnom niti, žar vatre i sunce je već poznato da je jedan od oblika prijenos topline je zračenje, tako da tražio je znanstveno objašnjenje koje bi mogle dati ideju o količini energije koju oslobađa tijelo grijanom, tzv toplinska zračenja, primjerice, u proizvodnja čelika. Izvor: http://imag.search.com