A neat definition appeared recently in an article by Dwight Neuenschwander:
| Physics is the art of creating, testing, and improving a network of concepts, expressed as mathematical models, in terms of which the world becomes comprehensible. |
(from "Elegant Connections in Physics: Thinking Like a Physicist about Amortization Schedules" by Dwight E. Neuenschwander, one of a series in the Fall 2010 issue of Radiations, the magazine of Sigma Pi Sigma, the physics honor society) - ^z - 2011-03-01