Radiation thermometer cannot measure the temperature ___________________?
Correct answer: C. Of liquid oxygen
- A. Inside a pressure vessel
- B. Of an object without coming in contact with it
- C. Of liquid oxygen
- D. Of moving objects at high temperature
Explanation
Liquid oxygen is comparatively transparent to the radiation used by ordinary radiation thermometers, so the instrument may detect radiation from the container rather than the liquid itself. Radiation thermometers are otherwise useful for noncontact measurement of moving or very hot objects.
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