![]() But I don't think that is in our limit(currently). It is possible to reduce the entropy of the universe (as a whole) only if we are able to compress it from outside and reduce the expansion of energy, making it forcibly contained into a small region. Again, it favours, expansion of the entire universe as a whole, which again leads to increasing entropy. ![]() Although, over all, the total entropy seems to be increasing. It is considered as a open system, where there is exchange of energy and matter involving the boundary of the observable universe. but only lowered in a local area by interacting with a larger outer area (it sort of gives you a place to dump some excess entropy). 4) Dissolved substance have higher entropy then its undissolved form. 3) Dilute solutions have higher entropy than concentrated solutions. 2) Low pressures have higher entropy than high pressures. 1) Gases have higher entropy than liquids, and liquids higher than solids. ![]() Now, the observable universe (limit to what we humans can see), is just a subset of the entire universe. The following is a list of things that increase or decrease entropy. Even if you consider the entire universe, having no surrounding doesn't impact it's expansion. The universe is expanding from inside, that way, it's overall boundary is also expanding, hence with the expansion of overall boundary, it's energy is also expanding/spreading out. Hence, due to this reason, the overall change in entropy of the universe is always positive, and cannot be negative.Īlso, it is important to consider i)entire universe (isolated system), ii)Observable universe (open system). If energy is spreading out, then change in entropy is positive $\Delta S > 0$, but if, energy is contracting into a small region, then change in entropy is negative $\Delta S < 0$.Īs, I have already mentioned, the universe is always expanding, hence, it's overall energy is also expanding. Change in entropy $\Delta S$, is measured on the basis of whether the energy is being spread out or being contracted into a small region. Entropy is a measure of how much energy is spread out. It is important to know that the universe is always expanding, which also results in expansion of energy. ![]()
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