Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
on is the force ofattraction which holds atoms and molecules of the same bodies to-gether ; as, for example, a mass of stone, iron, or wood. This figure represents two hemi-spheres of lead, with their flat sur-faces made very smooth, and joinedtogether by firmly rubbing oneagainst the other. If… … 40 MATTER, FORGE, MOTION, AND MECHANICS. represents the atmospheric pressure) is required to draw them asunder;thus proving they are held together by cohesive attraction. Othersmooth substances present the same phenomena, but with differentdegrees of intensity. Cohesion can be shown independent of…
Physics · Astronomy
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