Expansion thermometers

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Expansion thermometers, the principle of operation of glass liquid thermometers is based on the thermal expansion of the thermometric liquid placed in a glass tank under the influence of temperature. The increase in volume under the influence of temperature has the following relationship: ∆ V = (β-3α) (t_-to)Vo^[m3], where α and β are the coefficients of volume expansion of the liquid and the glass of the thermocouple, 1/°C; t is the measured temperature, °C_;to is the temperature of filling the thermosystem with liquid equal to 20°C; _Vo is the volume of the thermocouple^,m3.

Expansion thermometers are used to measure temperature. The following thermometric liquids are used in glass thermometers: mercury Hg, ethyl alcohol _C2H5OH, toluene _C2H5CHOH, pentane _C5H2, kerosene, etc. Glass thermometers are divided into the following groups according to their purpose: reference, laboratory and technical.