Interacting Spiral Galaxies NGC 2207 and IC 2163. The gravitational forces of the large NGC 2207 galaxy are distorting the smaller galaxy. Image Credit: NASA, ESA, and The Hubble Heritage Team [STScI].
A spouting cylinder provides a visual demonstration of incompressible fluid pressure as a function of depth. Since water is nearly incompressible this is an experiment children can do themselves.
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