2.5 Resistance Thermometer
Gas thermometers are primary thermometers; but they require many corrections. They are replaced by secondary thermometers such as resistance thermometers and thermocouple thermometers, which are standardized by standard gas thermometer.
The resistances of pure metals increase with the increase in temperature. Resistance is treated as the thermometric property.
2.5.1 Platinum Resistance Thermometer
Platinum is suitable as a thermometric substance because of its high temperature coefficient of resistance, constancy of resistance at particular temperature and reproductivity. Platinum resistance thermometer was first constructed by Sir William Siemens in 1871.
Since then, several improvements have been made. The modern ...
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