Entropy is nature's bill for energy, availability is how much you can actually use, and power cycles turn heat into work while refrigeration does the opposite. Honestly, poring over these GATE notes feels like fixing that old Maruti's engine – you're just moving problems (heat) from one place to another, hoping the whole thing doesn't rattle apart. My real revision happens explaining these cycles to Ma over chai, because if she nods, I know I've got it.
#work#career
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