What is entropy? Also, can anyone explain how it relates to matter, gravity, time, other physics terms?
In: Physics
Another way to put it, more like eli5 is that all systems need energy to keep functioning. For example, to keep the temperature stable in a room you need to put energy into the system (the ac system). To keep your computer running you need electricity, to keep your car going you need fuel. Buildings need maintenance to stay up (or else they will crumble), living things need to eat… If you don’t put energy into a system, the system will eventually stop… Think a star: it just shine but no energy is going in so eventually stars die.
As energy is not infinite in the universe, eventually all energy will be spent, meaning the amount of energy in every point of the universe will be exactly the same as in every other point… The universe will be homogeneous and, as the previous person wrote, the temperature will be the same everywhere. There will no life, no movement, nothing.
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