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That is the first law of thermal engineering: Energy is conserved, and so is a good PDF.

So, the next time you see a frantic post on a Reddit forum saying, "Pls share Thermal Engg by Khurmi pdf, exam tomorrow," don't judge. You are witnessing a ritual.

For every mechanical engineering student in India, there is a rite of passage that has nothing to do with labs or lectures. It is the moment they type nine desperate words into a search bar: