A thermocouple vacuum gauge operates on the principle that at low pressures, the thermal conductivity of a gas is the function of .
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A.
pressure
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B.
resistivity
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C.
density
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D.
temperature
Correct Answer:
A. pressure
Explanation:
A thermocouple vacuum gauge functions based on the principle that, within a low-pressure environment, the thermal conductivity of a gas depends directly on its pressure. In this range, the number of gas molecules available to transfer heat from a heated filament to the gauge's sensor decreases as the pressure drops. By measuring the resulting change in temperature or thermal conduction, the device can accurately determine the vacuum level of the system.
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