**Fermi problem - Wikipedia**
https://en.wikipedia.org/wiki/Fermi_problem

In physics or engineering education, a Fermi problem, Fermi quiz, Fermi question, Fermi estimate, order-of-magnitude problem, order-of-magnitude estimate, or order estimation is an estimation problem designed to teach dimensional analysis or approximation of extreme scientific calculations, and such a problem is usually a back-of-the-envelope calculation. The estimation technique is named after physicist Enrico Fermias he was known for his ability to make good approximate calculations with little or no actual data. Fer…

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