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**Example: Air Pressure Drops to 0 psig, Oxygen Pressure is at 50 psig**

a) If air pressure drops to 0 psig, the 20 psig from the spring will try to close the seat on the oxygen side to attempt to stop the alarm from going off.

b) However, since the pressure flowing past the seat on the oxygen side is 50 psig (higher than the 20 psig of the spring), this will open the seat, signaling the alarm.

Answer :

Final answer:

When air pressure drops to zero, a spring tries to prevent an alarm by closing the seat on the oxygen side. However, if the oxygen pressure is higher than the spring's, this will overcome the force of the spring, open the seat, and activate the alarm.

Explanation:

This question involves concepts of pressure, particularly Air Pressure and Oxygen Pressure. In this situation, the air pressure drops to 0 psig and the oxygen pressure is at 50 psig. A spring with a pressure of 20 psig acts as a guard in a pressure relief system. When the air pressure drops to zero, the spring tries to close the seat on the oxygen side to prevent an alarm triggered by pressure abnormalities from sounding. However, the pressure of the oxygen is higher (50 psig) than the spring (20 psig). This means the oxygen’s pressure overcomes the force of the spring, thus, opening the seat, and activating the alarm.

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