A pressure reading of 14.7 psi is equivalent to what?

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Multiple Choice

A pressure reading of 14.7 psi is equivalent to what?

Gauge pressure is how much pressure sits above the surrounding atmosphere, while absolute pressure is the total pressure including that atmosphere. At sea level, atmospheric pressure is 14.7 psi. If the absolute pressure is 14.7 psi, the pressure above ambient is 14.7 minus 14.7, which equals 0 psi gauge. So a reading of 14.7 psi absolute corresponds to 0 psig. In practical terms, the system is at atmospheric pressure, not pressurized above it.

Gauge pressure is how much pressure sits above the surrounding atmosphere, while absolute pressure is the total pressure including that atmosphere. At sea level, atmospheric pressure is 14.7 psi. If the absolute pressure is 14.7 psi, the pressure above ambient is 14.7 minus 14.7, which equals 0 psi gauge. So a reading of 14.7 psi absolute corresponds to 0 psig. In practical terms, the system is at atmospheric pressure, not pressurized above it.

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