Answer to Question #66761 in Molecular Physics | Thermodynamics for Jitender kumar

Question

Explain the working of a platinum resistance thermometer with the help of a neat and labelled diagram.

Answer 1

Platinum was proposed by Sir William Siemens as an element for resistance temperature detector at the Bakerian lecture in 1871: it is a noble metal and has the most stable resistance–temperature relationship over the largest temperature range. Nickel elements have a limited temperature range because the amount of change in resistance per degree of change in temperature becomes very non-linear at temperatures over 572 °F (300 °C). Copper has a very linear resistance–temperature relationship; however, copper oxidizes at moderate temperatures and cannot be used over 302 °F (150 °C).