The pressure of the gas in a constant volume gas thermometer is 70 kPa at the ice point. Find the pressure at the steam point.

Explanation

`P_1=70KPa,` P_2=?`
`T_1 = 273 K` T_2= 373K`
`T_1= P_1/P_tr xx 273.16`
`rArr 273 = 70/P_tr xx 10^3 xx 273.16`
`rArr P_tr =70 xx 273.16 xx 10^3 /273`
Again, `T_2 =(P_2 xx 273.16)/ P_tr`
`rArr 373 =(P_2 xx 273 xx 273.16)/ (70 xx 273.16 xx10^3)`
`rArr P_2= (373xx70xx10^3)/ 273=95.6 KPa`