In the days long gone, the Second Law of Thermodynamics–which predates the first law–was regarded as perhaps the most perfect and irrefutable law in all of science. It is used to calculate entropy, specific and latent heats, and transition properties, often with good accuracy. Important examples of this would be Planck’s realization when staring into a furnace that he could find Avogadro’s number, and Linus Pauling’s highly accurate “back of an envelope” calculation of the residual entropy of ice. The law, theorized in the early 1800’s by Nicolas Leonard Sadi Carnot and later r

 (2-3) Constant volume, reversible heat addition (Ignition)

Problems pertaining to the second law require the measurement of H to both the system and the surroundings, whether that system is either infinite or isolated. The standard equation for this change in entropy, given the symbol S, is as follows.

In the internal combustion engine, or spark plug engine, the system is closed and air acts as our working fluid (or substance that promotes the change in energy) and is modeled as an ideal gas in the following cycle. A reversible heat transfer process is shown in the combustion of fuel and air. The comparison and expansion processes are said to be isentropic (or changing and returning to a certain state in response to a stimulus). It can all be shown in the diagram below of the Otto cycle.

Now that we have covered how the second law is calculated and related to the universe, the question still remains, how does it affect me in my everyday life? The answer, in my opinion, is quite simple. Many of the inventions we use everyday perfectly demonstrate this prevailing law. The oven, refrigerator, and computer are all examples

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