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Many answers are possible for this exercise. Consider the
following:
A hollow glass cylinder is a meter long and has an internal
diameter of a centimeter. It is open at one end, sealed at the other and
graded with millimeter measurements. A bath of mercury is maintained at a
temperature of
 . The
cylinder is immersed in the bath, allowing it to fill with mercury. While
keeping the open end immersed, the cylinder is held vertically, with the
sealed end about 950 centimeters above the surface of the mercury. A column
of mercury is suspended within the cylinder. Its height is measured in
centimeters and is multiplied by 0.01316. The result is recorded. This
procedure is a measure. We interpret the recorded number as air pressure
measured in atmospheres. The interpretation is a metric. |
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