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avgwhtguy1 ago

Entropy increasing is not a law of thermodynamics -- the law of increasing entropy pertains to a system. The types of systems which were studied to create the laws of thermodynamics were internal combustion engines. Inside an internal combustion engine, entropy can be assumed to always be increasing. The law is pragmatic, not some universal truth.

magnora ago

It's literally the second law of thermodynamics that entropy cannot decrease in a closed system.

avgwhtguy1 ago

Exactly - in a closed system, not the universe. And the closed systems for which thermodynamic law was invented to describe are combustion engines. Outside of the closed system, thermodynamics says nothing about entropy increasing, and for closed systems that dont resemble combustion engines, thermo is less useful.

magnora ago

The universe is defined as a closed system, but I suppose that's an assumption, or a just definitional thing. We can't know what the "universe" is like beyond guesses, because we simply cannot see it all, not even close. So in that sense I agree