Answer :
Final answer:
The correct answer is A. 33.9 degrees The barometric loop should be positioned at the height equivalent to the height that a water column can sustain against atmospheric pressure, which is 33.9 feet.
Explanation:
The question 'A barometric loop is ____ above the highest piping' refers to a safety mechanism used in plumbing to prevent backflow due to siphoning. The correct distance a barometric loop should be above the highest piping is not provided directly in the options, but by understanding the principles of barometry and the information given about barometers and atmospheric pressure, an informed estimation can be made.
Barometers measure atmospheric pressure using mercury or water, with mercury columns typically about 760 mm tall and water columns being significantly taller due to the lower density of water. As per the information provided about the barometers in vacuum, the water levels reach about 33.9 feet, which suggests that the correct answer for the height of a barometric loop should be equivalent to the height a water column can sustain against atmospheric pressure. Therefore, the answer is 33.9 feet, which is relevant to safety considerations in plumbing systems.In this case, the barometric loop is 33.9 feet, as stated in the question. This means that the highest piping is 33.9 feet above the barometer.
