Home
Back
PSI Conversion Formula:
| From: | To: |
PSIG to PSI conversion is the process of converting gauge pressure (PSIG) to absolute pressure (PSIA). Gauge pressure is measured relative to atmospheric pressure, while absolute pressure includes atmospheric pressure.
The calculator uses the pressure conversion formula:
Where:
Explanation: This conversion accounts for the atmospheric pressure that is always present but not measured by gauge pressure instruments.
Details: Accurate pressure conversion is crucial for engineering calculations, fluid dynamics, HVAC systems, and scientific research where absolute pressure values are required for precise measurements and calculations.
Tips: Enter the gauge pressure value in PSIG. The calculator will automatically convert it to absolute pressure in PSIA using the standard atmospheric pressure of 14.7 psi.
Q1: What is the difference between PSIG and PSI?
A: PSIG refers to gauge pressure (relative to atmospheric pressure), while PSI typically refers to absolute pressure that includes 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: When should I use absolute pressure vs gauge pressure?
A: Use absolute pressure for scientific calculations, vacuum measurements, and thermodynamic equations. Use gauge pressure for most industrial and mechanical applications.
Q4: Can atmospheric pressure be different from 14.7 psi?
A: Yes, atmospheric pressure varies with altitude, temperature, and weather conditions. 14.7 psi is the standard reference value.
Q5: How does altitude affect the conversion?
A: At higher altitudes, atmospheric pressure decreases, so the conversion factor would be less than 14.7 psi for precise calculations.