Units are based on standards wherein we define measurable quantities, such as length, mass, time, and so on. The units vary depending on the size of things we are measuring. For example, we would not measure the distance across the United States in inches; that is much too small a unit. Instead we would use a unit such as miles or kilometers. It is very handy to be able to convert back and forth between like units, such as miles, inches, and kilometers. This chapter will present some of the various ways of measuring, recording, and converting between units (Figure 1.1).
FIGURE 1.1 Measuring instruments.
1.1 SCIENTIFIC ...
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