Which of the following types of thermometer is used for the calibration of other thermometers?

Which of the following types of thermometer is used for the calibration of other thermometers?
  • A.
    liqud-in-glass thermometer
  • B.
    constant volume gas thermometer
  • C.
    optical pyrometer
  • D.
    thermocouple
Correct Answer: Option B
Explanation
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