Massachusetts 2nd Class Fireman's Practice Exam

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What is the absolute pressure when converting 160 PSI?

145.3 psia
160 psia
167.3 psia
174.7 psia

The correct answer is: 174.7 psia

To determine the absolute pressure from a gauge pressure reading of 160 PSI, it's essential to recognize how absolute pressure is calculated. Absolute pressure is the sum of gauge pressure and atmospheric pressure. Atmospheric pressure is typically taken to be about 14.7 PSI at sea level. To find the absolute pressure: 1. Start with the gauge pressure, which is 160 PSI. 2. Add the atmospheric pressure to this value. So the calculation would be: 160 PSI (gauge pressure) + 14.7 PSI (atmospheric pressure) = 174.7 PSIA. This calculation shows that 174.7 PSIA represents the total pressure experienced at that moment, taking into account both the pressure measured and the inherent atmospheric pressure surrounding it. Therefore, when converting 160 PSI to absolute pressure, the correct result is indeed 174.7 PSIA.