< Previous Section Home Next Section >

Section 4.5
How Small is “Small Enough”?

There is no rule to tell you how small is "small enough" - you must use your own judgment. Pay attention to units if there is a context. For example, if “1” represents one light-year but you are measuring the change in a metal rod’s length as it expands, then what looks like a small number actually could represent a large length relative to the rod’s expansion.