I think my most interesting experiment is pump testing on live pumping stations. It’s fascinating to see how theory works in practice and how pumps deteriorate over time.
Before I worked in engineering I saw a demo at Uni with two pieces of paper held at the top. The lecturer then blew between the sheets, the result was the two sheets of paper being drawn towards each other. It’s not what you expect, I like experiments that challenge / confuse the mind.
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