RATIO SCALE
Ratio scales are those most commonly encountered
in physics and are possible only when there exist
operations for determining all four
relations: equal-ity, rank-order, equality of intervals, and equality of
ratios. Once such a scale is erected, its numerical
values can be transformed (as from inches to feet)
only by multiplying each value by a constant.
An ab-solute zero is always implied, even though the zero
value on some scales (e.g. Absolute Temperature) may