## Conversion of Units

Sometimes it is necessary to convert units from one measurement system to another or convert within a system (for example, from kilometers to meters). For Example, conversion factors between SI and U.S. customary units of length are as follows: 1 mi l e = 1,609 m = 1.609 km 1 m = 39.37 i n. = 3.281 ft 1 ft = 0.304 8 m = 30.48 cm 1 i n. = 0.0254 m = 2.54 cm (exactly)

## Example 1:

Convert 15.0 i n. to cm 15.0 i n.= (15.0 i n.)((2.54 cm)/(1 i n.)) = 38.1 cm

## Example 2:

A car is traveling at a speed of 38.0 m//s. Is the driver exceeding the speed limit of 75.0 mi//h? Convert m//s to mi//h: (38.0 m)/(1s)((1 mi)/(1609 m))((60s)/(1mi n))((60mi n)/(1h))=85.0 mi//h