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{{quote|At last some remarks are made about the transfer of momentum from the Sun to the planets, which is fundamental to the theory (§11). The The ideal MHD equations consist of the [[continuity equation]], the [[Cauchy momentum equation]], [[Ampere's Law]] neglecting displacement current, and a [[Conse

...example of such a system is a [[fluid]] with [[temperature gradient]]s in space causing heat to flow from hotter regions to colder ones, by the random but ...tor <math> \bf{p}</math> (thus occupying a very small region of [[momentum space]] <math>\mathrm{d}^3 \bf{p}</math>), at an instant of time.