A water vapour thermometer is calibrated at the ice and steam points and the saturation

Question

vapour pressures (s.v.p) are measured. The saturation vapour pressure Pθ is given by
P  P01   2 , where P0 is the s.v.p at the ice point, θ is the temperature in ˚C on
the Celsius scale, α and β are constants and α = 40 β ˚C. Determine the temperature of a
medium on the water vapour scale if its temperature on the Celsius scale is 50 ˚C