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Originally Posted by [B
Deconstructor;3517661]
Logic 2:
This relates to physics. The law of conservation of energy (which has never been proven wrong, only modified) states that energy is never lost. Instead, it merely undertakes other forms; for example, the heat energy from a burning fire is converted into chemical energy (the reason why the logs are burnt) and light.
If that scientific law is true, then Kyubey is wrong. The energy of the universe is not decreasing. Something must be using that lost energy. If it stands to say that humans can create energy with their emotions, then it also stands to say that another being should be able to do the reverse: destroy energy.
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No, Kyuubey isn't wrong. The subs did the physics injustice. What kyuubey mentioned about entropy doesn't violate the law of conservation of energy. What Kyuubey was trying to illustrate through the example of a log burning is that Entropy increases, in other words, energy is dispersed. Energy in the universe evens out, for example, when 2 objects of differing thermal energies come into thermal contact, heat flows from the object with greater thermal energy to that with lower thermal energy until they reach thermal equilibrium, i.e. both have the same thermal energy. Given that the energy evens out, there is no energy gradient for heat to flow, therefore there is a
LOSS IN USEFUL ENERGY, EXERGY.
Basically, Kyuubey's concern is the spreading out of energy, or rather, the universe approaching maximum entropy. When that occurs, useful energy cannot be harvested from a homogenous system of particles. It's pretty far fetched imo since it'll take a very long time, if ever, for the universe to reach that state.
P.S. About the log burning, it's combustion of hydrocarbons, and releases energy in the form of heat. It's chemical energy being converted to thermal energy, not the other way round. This illustrates entropy as molecules bound close together as a solid is converted into gas, where there are more ways of distributing energy, hence entropy increases in the universe. The products formed from combustion, water, carbon dioxide, carbon monoxide, etc. are more stable than hydrocarbons in the wood, hence a reverse reaction is unlikely, therefore, no useful energy in the FORM OF HEAT can be produced from these products. That's part of Kyuubey's concern.