In this part [2:25 - 3:00] of the lecture, the professor Walter Lewin says that the human body is nothing but vacuum but he did not give a proof of his sayings. Could anybody please provide some detailed answer or references to books or articles which debates this specific topic.
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In my humble opinion, Professor Lewin has entered the realm of philosophy. So, in one regard it is apparent that the particulate constituents of the human body are concentrations of bound energy with large "spaces" between particulate masses. In another, there has never been a measurement of the value of the so-called "space" between particulate entities in a bound, let's say "Quantum" system. One could assume that any given space between particulates (solar system, galaxies) is relatively devoid of discrete atoms and therefore a vacuum. But then, that brings up the question...what is "space"? in a physical sense. Perhaps if Lewin revised his statement to "space" instead of "vacuum" it might be more correct.
PaleoMan
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