** Next:** Order of Magnitude Calculations
**Up:** Introduction
** Previous:** Dimensional Analysis

**Idea: **
Units can be treated as algebraic quantities.
For example, we can use the conversion factor 1 in = 2.54 cm to
rewrite 15 inches in centimeters.

15 in = 15 in 38.1 cm
| (1) |

10/9/1997