Celsius temperature scale

The Celsius temperature scale employs a degree of the same magnitude as that of the ideal gas scale, but its zero points are shifted, so that the Celsius temperature of the triple point of water 0.01 degree Celsius or 0.01⁰C. 

If t denotes the Celsius temperature, then 

t = T - 273.15⁰ 

Thus the Celsius temperature ts at which steam condenses at 1-atmosphere pressure 

t_s = T_s - 273.15⁰ 

    = 373.15 - 273.15 = 100.00 ⁰C

Similar measurements for ice points show this temperature on the Celsius scale to be 

0.00 ⁰C.