Which of the following pressure-related statements is correct?Group of answer choicesGauge Pressure = Absolute Pressure – Atmospheric PressureAbsolute Pressure = Gauge Pressure – Atmospheric PressureAbsolute Pressure = Atmospheric Pressure – Gauge PressureGauge Pressure = Absolute Pressure + Atmospheric PressureGauge Pressure = Atmospheric Pressure – Absolute Pressure
Question
Which of the following pressure-related statements is correct?Group of answer choicesGauge Pressure = Absolute Pressure – Atmospheric PressureAbsolute Pressure = Gauge Pressure – Atmospheric PressureAbsolute Pressure = Atmospheric Pressure – Gauge PressureGauge Pressure = Absolute Pressure + Atmospheric PressureGauge Pressure = Atmospheric Pressure – Absolute Pressure
Solution
The correct statement is: Gauge Pressure = Absolute Pressure – Atmospheric Pressure.
Here's why:
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Gauge Pressure is the pressure measured relative to the atmospheric pressure. In other words, it's the pressure above the atmospheric pressure.
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Absolute Pressure is the total pressure at a point in a fluid. It's the sum of the atmospheric pressure and the gauge pressure.
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Therefore, if you want to find the Gauge Pressure, you subtract the Atmospheric Pressure from the Absolute Pressure. This gives you the pressure that's above the atmospheric pressure, which is the Gauge Pressure.
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