What is the principle or mechanism of how a thermocouple measures temperature?

  1. Resistance of metal oxide relates to temperature
  2. 2 dissimilar metals develop a potential difference (voltage difference) according to temperature
  3. Metal semiconductor which changes its resistance in a predictably non-linear fashion (run-away exponent) with temperature
  4. When heated, the kinetic energy of the liquid increases and it expands, forcing it up the capillary which correlate with temperature