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Physics
Classical Physics
Thermodynamics
First law of thermodynamics, mass/energy in the Universe
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[QUOTE="hilbert2, post: 6006073, member: 482973"] The entropy of an isolated system can increase. Suppose we have a cubical isolated container with volume of ##1m^3##, and containing an ideal gas that is for some reason all located in one half of the cube at the initial state. In a quite short time after the initial moment, the gas will be distributed to fill the whole cube evenly, while its temperature is the same as initially because expanding to vacuum does not consume energy and the temperature of an ideal gas depends only on the internal energy and number of moles. Now, as the gas is occupying a larger volume, its entropy has to definitely be larger than initially, because there's no temperature drop that would counteract the effect of the volume change on entropy. [/QUOTE]
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Physics
Classical Physics
Thermodynamics
First law of thermodynamics, mass/energy in the Universe
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