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As instructors we expect our students to understand what the numbers they generate "mean". We expect them to be able to visualize, in real or virtual terms, some physical approximation of the "things" they are working with. This visualization provides the basis for a "logic check" on their calculations.Our profession is founded on our ability to specify, within imposed constraints, the physical and functional characteristics of a system that will provide a safe, affordable solution to adoi:10.24908/pceea.v0i0.3604 fatcat:ay2xicfcrfg75l2avrx7fd43la