Pick out the one which is a first order instrument ?
(A) Mercury in glass thermometer (without any covering or air gap)
(B) Bare metallic thermometer
(C) Bare vapor pressure thermometer
(D) All
Pick out the one which is a first order instrument ?
(A) Mercury in glass thermometer (without any covering or air gap)
(B) Bare metallic thermometer
(C) Bare vapor pressure thermometer
(D) All
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