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(A) The electromotive force $(E)$ in a thermocouple is given by the relation: $E = \alpha 	heta + \frac{1}{2} \beta 	heta^2$,where $	heta$ is the t

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Neutral temperature

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(A) The electromotive force $(E)$ in a thermocouple is given by the relation: $E = \alpha 	heta + \frac{1}{2} \beta 	heta^2$,where $	heta$ is the temperature difference between the hot and cold junctions.Neutral temperature $(	heta_n)$ is the temperature of the hot junction at which the thermo-emf is maximum and the thermoelectric power becomes zero. It is a constant property of the pair of metals used and is independent of the temperature of the cold junction $(	heta_c)$.In contrast,the temperature of inversion $(	heta_i)$ depends on the temperature of the cold junction $(	heta_c)$ according to the relation: $	heta_i - 	heta_n = 	heta_n - 	heta_c$.

In a thermocouple,the temperature that does not depend on the temperature of the cold junction is called

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