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Additional Resources for you to Explore
Fermi problem, Fermi question, or Fermi estimate is an estimation problem designed to teach dimensional analysisapproximation, and the importance of clearly identifying one's assumptions. (Wikipedia) Physicists like to use estimation to first find out the scale, feasibilty and key concepts of an investigation.  Further readings (1) Introduction to Fermi questions (2) Fermi question training material (3) Fermi questions in Physics