Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?
Correct answer: C. Radiation/infrared pyrometer
- A. Mercury in glass thermometer
- B. Filled system thermometer
- C. Radiation/infrared pyrometer
- D. Thermo electric pyrometer
Explanation
A radiation or infrared pyrometer detects thermal radiation emitted by the object, so it can measure temperature without physical contact. Filled and mercury-in-glass thermometers require contact for heat transfer to the sensing element.
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