Constant Volume Gas Thermometers

For a constant volume gas thermometer, one should fill the gas at:

The pressures of the gas in a constant volume gas thermometer are $80 \mathrm{cm}$, $90 \mathrm{cm}$ and $100 \mathrm{cm}$ of mercury at the ice point, the steam point and in a heated wax bath respectively. Find the temperature of the wax bath.

The pressure of the gas in a constant volume gas thermometer is $70 \mathrm{kPa}$ at the ice point. Find the pressure at the steam point.

A constant volume thermometer registers a pressure of $1.500\times {10}^4\text{ \hspace{0.17em}}\mathrm{Pa}$ at the triple point of water and a pressure of $2.050\times {10}^4\text{\hspace{0.17em} }\mathrm{Pa}$ at the normal boiling point. What is the temperature at the normal boiling point?