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Physics A mathematical representation for First Law Reading carefully, you may notice that this statement of the first law there is not much reference to quantitative information, or about the nature of this work. Often the scientific community protests against this kind of statement, because, in most situations a theory can only accessions when it can be read by means of mathematical sentences. We will then search for a sentence such this statement? As the statement says, work in an isolated system is the same regardless of the path. Thus, in thermodynamics, we define a quantity called the "internal energy of the system" (U), whose difference (U ) between the final and initial states is equal to the work (W iso ) conducted an isolated process. As the process is isolated, the work is done by the system. Mathematically we write: iso iso Another way to interpret the preceding equations, it is considered that the work done in a process in which the system is isolated is equal to the decrease of the internal energy of the system. When an expansion or contraction of a gas (without the interference of an external medium) say there doing work for the system at the expense of internal energy. A situation like this can be seen when the smell of a perfume spreads throughout a room spontaneously. But what about the heat? In situations like boiling milk or wire being stretched, carrying out work resulted in changes in volume and length. Note, however, that the volume of milk alone did not increase, but we had to put the milk on the fire. It was not a spontaneous process, milk in this case is not an isolated system. But to be heated milk ends performing work. Thus, finally, the heat is understood in terms of the difference between the total work (W) performed during the work process and a process in which the system is isolated (W iso W - W iso In the case which rises in milk and dairy sheds, work for increasing the volume is made for the heat flux to the system. The milk does not boil if it was not being heated in the fire, is not an isolated system. Models Heat
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Fizika Matematički zastupanje Prvi Zakon Čitanje pažljivo, možda ćete primijetiti da je ova izjava prvog zakona nema puno pozivanje na kvantitativne podatke, ili o prirodi tog posla. Često je znanstvena zajednica prosvjedi protiv ove vrste gubitka, jer je, u većini situacija teorija može samo pristupima kada se može čitati pomoću matematičkih rečenica. Mi smo tada će tražiti kaznu takvu ovu izjavu? Kako navodi se u priopćenju, rad u izoliranom sustavu je ista bez obzira na putu. Dakle, u termodinamiku, možemo definirati količinu zove "unutarnja energija sustava" (U), čiji je razlika (Uf - Uja) između krajnjih i početna stanja jednaka je rad (Wiso) provela izolirani proces. Kao proces je izoliran, djelo je učinjeno od strane sustava. Matematički pišemo: Uf - Ui = - Wiso Uja - Uf = Wiso Drugi način interpretirati prethodne jednadžbe, smatra se da je rad u procesu u kojem je sustav izoliran jednaka do smanjenja unutarnje energije sustava. Kad ekspanzije ili kontrakcije plin (bez uplitanja vanjski medij) kažu da radi posao za sustav na štetu unutarnje energije. Takva situacija može se vidjeti kada je miris parfema širi po cijeloj sobi spontano. No, što je s toplinom? U situacijama poput kipuće mlijeko ili žice koja se protezala, obavljanje posla dovelo do promjena u volumenu i dužini. Napomena, međutim, da je količina mlijeka sama nije povećala, ali smo morali staviti mlijeko na vatru. To nije bio spontani proces, mlijeko u ovom slučaju nije izolirani sustav. No, kako bi se zagrijanog mlijeka završava obavljanje posla. Dakle, konačno, toplina se razumjeti u smislu razlika između ukupnog rada (W) koji je obavio tijekom radnog procesa, a proces u kojem je sustav izoliran(ISO W - Wiso U slučaju koji se diže u mlijeku i mliječnim drvarnicom, rad za povećanje glasnoće je za toplinskog toka u sustavu. Mlijeko ne svode ako netko ne zagrijava u vatri, nije izolirani sustav. Modeli topline87