Pick out the one which is a first order instrument ?
Correct answer: C. All A., B. and C.
- A. Mercury in glass thermometer (without any covering or air gap)
- B. Bare metallic thermometer
- C. All A., B. and C.
- D. Bare vapor pressure thermometer
Explanation
Each bare thermal instrument listed can be represented by a first-order energy-balance model, with one dominant thermal capacitance and resistance producing a single time constant. Therefore all three are first-order instruments.
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