![]() ![]() Imagine a football tightly filled with air and a large empty balloon which you want to fill by transferring all of the football's air to the balloon, while doing so you are giving the air in football an opportunity to show off its energy (enthalpy) by getting size (entropy) as large as the enthalpy or energy of this air is.Īn interesting fact also worth noting is that when you release the air in football to the large balloon, you also increase the hunger or thirst of this air for heat or warmth from nearby objects, surroundings or environment because now this air (after being released has become cooler and as you know that cool things absorb heat energy from surrounding environment on the other hand when earlier we put the air in football previously it turned warmer hence this air tried to release its warmth to the environment. Notice that steam after being released can gain the size (entropy) as large as enthalpy (energy) within it.īelow are some more examples explaining the terms entropy and enthalpy for instance releasing of a confined gas such as steam in a pressure cooker results in the reduction of the anger of steam molecules (temperature of them) that is when we put off weight from pressure cooker's top and let the steam be filled into a large balloon we notice that the temperature of steam now in the balloon is far less as compared with the temperature of steam when it was within the pressure cooker. ![]() The same is the situation of the molecules of a gas imprisoned (confined) in a closed container i.e. Therefore increase in someones liberty or allowance or freedom is equal to increasing the entropy which consequently results in the the reduction of someones anger or in other words cooling down temperature such as reduction in the anger of innocent people put in prison while they are released. reducing liberty or putting ban on someones freedom and this ban can produce an anger and in the terminology of thermodynamics, this anger can be imagined as temperature. We can imagine energy of young or old people as their enthalpy which is in a sense also indicative of their desire of liberty or freedom, while limiting or reducing someones liberty is analogous to reducing someones entropy i.e. This example from social lives of humans may not show any resemblance with physics sub topic of thermodynamics and its terms such as entropy and enthalpy but this example has a sure analogy (resemblance) with these terms. They always wanted to play and run fast therefore they wanted permissions from their parents to participate in sports that could even harm them so they wanted more allowances, liberties and freedoms from their parents, because such allowances are demand of their energy. When entropy increases, a certain amount of energy becomes permanently unavailable to do work.Explanation of terms entropy and enthalpy which are related to physics sub topic of thermodynamics using analogy (resemblance) from social lives of humans, thus below is the explanation.Ī group of young friends in the peak of their youth is very energetic and needs a large play ground to play football or hockey etc, while, when the same group of friends becomes old they become less energetic and then they only need a corner in a small coffee shop to sit together and remember the days of their youth, the memories of those days when they were more energetic and they always wanted to wander here and there. Entropy is associated with the unavailability of energy to do work. In the second case, entropy is greater and less work is produced. The same heat transfer into two perfect engines produces different work outputs, because the entropy change differs in the two cases. There is 933 J less work from the same heat transfer in the second process. We noted that for a Carnot cycle, and hence for any reversible processes, ![]() We can see how entropy is defined by recalling our discussion of the Carnot engine. That unavailable energy is of interest in thermodynamics, because the field of thermodynamics arose from efforts to convert heat to work. Although all forms of energy are interconvertible, and all can be used to do work, it is not always possible, even in principle, to convert the entire available energy into work. Entropy is a measure of how much energy is not available to do work. ![]() Recall that the simple definition of energy is the ability to do work. Making Connections: Entropy, Energy, and Work ![]()
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