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Temperature measurement with a thermocouple

Temperature measurement with a thermocouple

Item no.: P1042400

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If two different metals are in contact, a contact potential results from the different electron affinity of the metals' surfaces. The size of this potential is a function of the temperature since the electron's kinetic energy increases with increasing temperature.
These potentials also occur when the thermocouple is connected to a voltmeter. However, they cancel each other (i.e., they do not falsify the measuring results) if both leads which are connected to the meter are of the same material.
A thermocouple consists of a pair of different metals, e.g. iron and constantan. If the two contact points have different temperatures, the difference between the contact potentials can be measured as thermo potential.


  • Real stand material for an esecially stable and safe setup
  • Student-suitable experiment descriptions with reports available
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p1042400e.pdf Experiment guide, English 560.08 KB

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