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PSIG Formula:
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PSI to PSIG conversion calculates gauge pressure from absolute pressure. PSI (pounds per square inch absolute) includes atmospheric pressure, while PSIG (pounds per square inch gauge) is pressure relative to atmospheric pressure.
The calculator uses the PSIG formula:
Where:
Explanation: This conversion subtracts atmospheric pressure from absolute pressure to obtain gauge pressure, which is commonly used in industrial and mechanical applications.
Details: Accurate pressure conversion is essential for engineering calculations, pressure vessel design, pneumatic systems, and safety compliance in various industrial applications.
Tips: Enter absolute pressure in PSI. The value must be greater than 0. The calculator will automatically subtract 14.7 psi (standard atmospheric pressure) to give you the gauge pressure.
Q1: What is the difference between PSI and PSIG?
A: PSI is absolute pressure (includes atmospheric pressure), while PSIG is gauge pressure (excludes atmospheric pressure).
Q2: Why is 14.7 psi used for atmospheric pressure?
A: 14.7 psi is the standard atmospheric pressure at sea level. This value may vary slightly with altitude and weather conditions.
Q3: Can PSIG be negative?
A: Yes, PSIG can be negative when the absolute pressure is less than atmospheric pressure, indicating vacuum conditions.
Q4: When should I use PSI vs PSIG?
A: Use PSI for scientific calculations involving absolute pressure, and PSIG for most industrial and mechanical applications where pressure is measured relative to atmospheric pressure.
Q5: Is this conversion accurate at high altitudes?
A: The conversion uses standard sea-level atmospheric pressure. For high-altitude applications, adjust the atmospheric pressure value accordingly.