How do you convert psig to psia?

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Multiple Choice

How do you convert psig to psia?

Explanation:
Gauge pressure is how much pressure sits above the surrounding atmosphere, while absolute pressure includes that atmospheric baseline. To get psia from psig, you must add the atmospheric pressure. At sea level, that baseline is 14.7 psi, so psia = psig + 14.7. For example, a gauge reading of 30 psi becomes 44.7 psi in absolute terms. If the gauge reads below zero (a vacuum), you still add 14.7 to find the absolute pressure. Subtracting, dividing, or multiplying by 14.7 wouldn’t convert correctly.

Gauge pressure is how much pressure sits above the surrounding atmosphere, while absolute pressure includes that atmospheric baseline. To get psia from psig, you must add the atmospheric pressure. At sea level, that baseline is 14.7 psi, so psia = psig + 14.7. For example, a gauge reading of 30 psi becomes 44.7 psi in absolute terms. If the gauge reads below zero (a vacuum), you still add 14.7 to find the absolute pressure. Subtracting, dividing, or multiplying by 14.7 wouldn’t convert correctly.

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