Always use suitable units of measurements which are easy to comprehend. We normally use these units with in out communication. As no body will tell his age in hours and distance between two cities in feets. You will not use units of tons in your kitchen. Diameter of pipes is normally given in inches and diameter of earth is mentioned in km.
We always try to use the unit making the intensity and size of the things understandable. Water consumption per person per day is discussed in liters/day whereas flow through canals is measured in Cusecs. The capacity of tanks is given in liters and storage of Dams is measured in MAF (million acres of feet). Similarly thickness of plates is given in mm not feets or meters. Sizes of atoms are described in angstrom (A) = 10 raise to power (-10). Dust particles are measured in Microns.
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