Solve the following problem:
The Rankine temperature scale assigns a numerical value of exactly 491.67 R to the triple point of water. The ratio of two temperatures is defined as the limiting ratio, as PTP → 0, of the corresponding pressures of a gas kept at constant volume.
(a) Find the best experimental value of the normal boiling point of water on this scale.
(b) Find the temperature interval between the freezing point and the boiling point.