Discussion
Which fraction of the atmosphere's total potential energy is actually available?
Answer: B
Lorenz showed that the available portion is only about 0.5 per cent of the total potential energy, because most of the mass is already close to its lowest attainable arrangement. Even that small fraction is around ten times the kinetic energy of the general circulation, so it is more than sufficient. The calculation is a useful corrective to the intuition that a large reservoir implies a large usable supply. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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