Excerpt from Introductory Course of Natural Philosophy for the Use of Schools and Academies: Edited From Ganot's Popular Physics
Bodies are made up Of small particles, called Molecules, and these again are composed Of still smaller elements, called Atoms. These atoms are inconceivably small, and are held in their places by the action Of two opposing systems Of forces, called Molecular Forces. Those which tend to draw atoms together are called Attractive Forces, and those which tend to push them asunder are called Repellent Forces. Heat is the principal if not the only repellent 'orce in Nature.
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