Standard thermometric substance - Thermodynamics

Q.  Which of the following is chosen as a standard thermometric substance?
- Published on 20 Aug 15

a. Gas
b. Thermocouple
c. Electric resistance
d. Mercury

ANSWER: Gas
 
When the temperature of a system is measured simultaneously with all the above thermometers which are in options, then it is found that there are considerable variations among the readings. But with experiments, it is found that the minimum variation is observed among the gas thermometers. Therefore gas is chosen as a standard thermometric substance.

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