An example of an analogy used by a physicst to explain science:
"The difference in behaviour between gases escaping at high and low densities can be easily understood if one remembers that the vapour is formed by a very large number of separate molecules rushing through space in all directions and continuously colliding with one another. When the density of vapour is high the stream of gas coming out through the opening can be compare with a frenzied crowd rushing through the exit doors of a burning theatre. Having passed the doors the people still bump into one another as they scatter in all directions on the street. When the density is low, on the other hand, it is as though only one person were passing through the door at one time and therefore proceeded straight ahead without interference."
George Gamow (1961) One, Two, Three…Infinity. Facts and speculations of science, Revised Edition, Dover Publications, Inc., New York.
