1. What is PSI to PSIG Conversion?

PSIG (pounds per square inch gauge) is the pressure measured relative to atmospheric pressure, while PSI (pounds per square inch absolute) includes atmospheric pressure. The conversion accounts for standard atmospheric pressure at sea level (14.7 psi).

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( PSI \) — Absolute pressure in pounds per square inch
• \( 14.7 \) — Standard atmospheric pressure at sea level (psi)

Explanation: This conversion removes atmospheric pressure to give gauge pressure, which is what most pressure gauges display.

3. Importance of PSIG Calculation

Details: Understanding the difference between absolute and gauge pressure is crucial in engineering, HVAC systems, industrial processes, and any application where pressure measurements are critical.

4. Using the Calculator

Tips: Simply enter the PSI value in the input field. The calculator will automatically subtract atmospheric pressure (14.7 psi) to give you the PSIG value.

5. Frequently Asked Questions (FAQ)

Q1: Why subtract 14.7 psi?
A: This accounts for standard atmospheric pressure at sea level, converting absolute pressure to gauge pressure.

Q2: Does this conversion change with altitude?
A: Yes, atmospheric pressure decreases with altitude. This calculator uses sea-level standard (14.7 psi).

Q3: What's the difference between PSI and PSIG?
A: PSI is absolute pressure (including atmospheric), PSIG is gauge pressure (excluding atmospheric).

Q4: When would I need this conversion?
A: When working with pressure specifications that use different reference points, or interpreting gauge readings.

Q5: What about PSIA?
A: PSIA is pounds per square inch absolute (same as PSI), while PSIG is gauge pressure.