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> Yes we did build steam engines before understanding thermodynamics but we still understood what it did (heat, pressure, movement, etc.)

We only understood in the broadest sense. It took a long process of iteration before we could create steam engines that were efficient enough to start an Industrial Revolution. At the beginning they were so inefficient that they could only pump water from the same coal mine they got their fuel from, and subject to frequent boiler explosions besides.



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