Work Done In Thermodynamics

The neutral temperature of a thermocouple is the temperature at which the thermo emf ( ) becomes zero. This temperature is important for the calibration and measurement in thermocouples. The given relationship for the thermo emf is: Where: - is the thermo emf, - is the temperature in Celsius, - and are constants. To find the neutral temperature, we set the thermo emf because at the neutral temperature, the emf is zero. Thus, we solve the equation for : Factoring the equation: This gives two solutions: - , which represents the cold junction temperature. - , which gives . Now, we see that for the neutral temperature to exist, the value of should give a positive temperature. However, in the form , there is no condition that guarantees a positive value for other than zero. Hence, there is no valid neutral temperature for the given equation. Thus, the correct answer is No neutral temperature is possible.