Question

The standard scale of temperature is

• A. The mercury scale
• B. The gas scale
• C. The platinum resistance scale
• D. liquid scale

Answer 1

Answer: (B)

The gas scale

Answer 2

Ideal Gas Scale: When pressure approaches zero, all real gas will behave like ideal gas, that is, PV of a mole of gas relying only on temperature. Therefore, we can design a scale with P V as its argument. Of course any bijective function will do, but for convenience's sake linear function is the best. Therefore we define it as: $T =\frac{1}{ nR } \lim _{ P \rightarrow 0}( PV )$ The ideal gas scale is still empirical since it puts gas at a special position and thus has limited applicability at some point no gas can exist.