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The Second Law of Thermodynamics The Second Law of Thermodynamics has several variations One version says that some heat is always wasted when converting heat into mechanical energy In other words all heat can not be completely converted into mechanical energy Another states that heat normally flows from high to low temperatures So why do hot cups cool off well the answer lies in the fact that the universe is expanding Say the universe started off infinitely small and infinitely dense then expanded at an exponential rate as fluctuations in density increased eventually forming galaxies This explanation of the universe would explain the existence of the thermodynamic arrow of time Because the universe is expanding disorder is increasing It cant be stopped No one and nothing is powerful enough to break the laws of thermodynamics Albert Einstein once said Thermodynamics is the only physical theory of general nature of which I am convinced that it will never be overthrown If you want to know whats going on in the physical world you simply have to look at the heat To understand the forward flow of time suppose that God decided that the universe should finish in a state of high order but that it didnt matter what state it started in This would mean that disorder would increase with time One could observe a broken bottle gathering itself together on the floor and jumping back up onto the table Such beings would have a psychological arrow of time that is backward This means that I could take a warm Pepsi set it on the counter and the colder particles in the room would become closer together and surround the bottle thus cooling the Pepsi This makes the second law of thermodynamics questionable Disorder increases with time because we measure time in the direction in which disorder increases Why dont we see broken things gathering themselves together or food being put back together after
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