If the pressure in a closed vessel is greater than the atmospheric pressure (the outside air), then a __________ switch is used to monitor the exact pressure inside the vessel (normally a tank).
If the pressure inside a closed vessel is less than the atmospheric pressure, then a __________ switch is used to monitor the lack of pressure inside the vessel.
A) vacuum; vacuum
B) vacuum; pressure
C) pressure; pressure
D) pressure; vacuum
Show Answer
Answer:D
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