Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 141
about four inches it will require a pullof nearly two hundred pounds to separate them. 134. The Relation of Tension and Pressure.—It is helpfulto think of the air in a bottle as a coiled spring (Fig. 74).If a weight of fifteen pounds rests upon the spring its ten-sion is fifteen pounds. Bythis we… … PRINCIPLES OF FLUID PRESSURE 123 will expand until its tension is only five pounds, etc. Thetension must always equal the pressure in order that theremay be equilibrium. The air acts like this spring, but it dif-fers in that it is indefinitely expansible. We may think of airin a bottle as being…
Physics
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