The first topic in these crossword notes focuses on the important idea of entropy, continuing the discussion of thermodynamics from the notes in the previous issue. The other two topics look at the key idea of limiting values in physics and at aspects of geometry that relate to crystal structure and (possibly) planetary orbits
In the last crossword notes (PHYSICS REVIEW Vol. 25, No. 2, pp. 28–29) the idea of reversibility and French physicist Sadi Carnot’s concept of a reversible heat engine were discussed.
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