If the cold junction of a thermo-couple is kept at 0°C and the hot junction is kept at T°C then the relation between neutral temperature (Tn ) and temperature of inversion (Ti ) is :

Tn = 2Ti  Tn = Ti – T Tn = Ti + T Tn = Ti /2

Tn = Ti /2

Since : Tn = \(\frac{T_i + T_c}{2}\) Tc = 0 [Tc = 0°C = temperature of cold junction]