What shows how two units of measurements are related?

Answer 1

Your question is rather curious; it's hard to tell what you're really asking. But I'm going to take a shot. If two units of measurement measure the same thing -- distance, area, volume, weight, density, current, velocity, power, work, energy, whatever! -- then there will be a conversion factor that converts one unit to the other. The conversion factor is not just a number; it will have units, too. That concept is best illustrated by example. Let's take two common and familiar units of distance, the inch and the foot. Let's say the distance from point A to point B is 10 feet, but we wish to express that distance in inches. If we know that there are 12 inches per foot, then we can say the conversion factor for converting feet to inches is 12 in/ft. Hence, we multiply 10 ft by 12 in/ft to get 120 in. Note how feet (ft) -- one in the numerator (10 ft) and one in the denominator (12 in/ft) -- cancel each other out, which leaves only inches.