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Thermoelectric series

Heating a soldered or welded connection joining two metals (e. g. to measure temperature) with cold, free ends leads to a thermoelectric voltage. This voltage represents the difference between the subsequently listed values, which refer to platinum as the reference point (zero) and to 100 °C as the difference in temperature. See Fig. 1 Thermoelectric series

Thermoelectric series Fig 1:  Thermoelectric series