Question

What is the fundamental interval of a thermometric scale

Answer 1

What is the fundamental interval of a thermometric scale

Answer

Two fundamental temperatures, corresponding to equilibrium points of one-component systems (fixed points), are usually specified in a temperature scale. **The distance between these points is called the fundamental temperature interval.** Such points as the triple point of water, the boiling points of water, hydrogen, and oxygen, and the freezing points of silver and gold are used as fixed points.

The upper and lower points of Centigrade scale are $100{}^{\circ}\mathrm{C}$ and $0{}^{\circ}\mathrm{C}$ and the fundamental interval is $100{}^{\circ}\mathrm{C}$.

The upper and lower points of Fahrenheit scale are $212{}^{\circ}\mathrm{F}$ and $32{}^{\circ}\mathrm{F}$ and fundamental interval is $180{}^{\circ}$.

The upper and lower points of Reaumur scale are $80{}^{\circ}\mathrm{R}$ and $0{}^{\circ}\mathrm{R}$ and fundamental interval is $80{}^{\circ}$.

The upper and lower points of Kelvin scale are $373\mathrm{K}$ and $273\mathrm{K}$ and the fundamental interval is $100{}^{\circ}$.

The upper and lower points of Rankine scale are $672{}^{\circ}\mathrm{Ra}$ and $460{}^{\circ}\mathrm{Ra}$ and the fundamental interval is $212{}^{\circ}$.