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8.T._cap_libro_temperatura_spiegazione_descr. lezioni prof: Norgia

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Temperature sensors measure changes in heat content due to temperature or state changes, not the absolute amount of heat.
Bimetallic strips are used for thermal sensing and consist of two metals with different linear expansivities; they can be shaped into springs or discs. These strips bend as temperatures change, allowing precise temperature measurement over small ranges but suffer from hysteresis issues.
Thermocouples use the Seebeck effect to generate a voltage proportional to the temperature difference between their hot and cold junctions, making them useful for measuring temperature differences but limited in range due to non-linear characteristics. They are sensitive and can be used in hazardous environments with appropriate liquid fillings.

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