1. What is PSIG Conversion?

PSIG (pounds per square inch gauge) is a unit of pressure relative to atmospheric pressure, while PSIA (pounds per square inch absolute) includes atmospheric pressure. The conversion between them is essential in various engineering and scientific applications.

2. How Does the Calculator Work?

The calculator uses the simple conversion formula:

Where:

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

Explanation: The formula subtracts atmospheric pressure from absolute pressure to get gauge pressure.

3. Importance of Pressure Conversion

Details: Accurate pressure conversion is crucial for engineering calculations, process control, and safety assessments in various industries including oil & gas, HVAC, and aerospace.

4. Using the Calculator

Tips: Enter PSIA value in pounds per square inch absolute (must be greater than 0). The calculator will automatically compute the corresponding 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 atmospheric pressure change with elevation?
A: Yes, atmospheric pressure decreases with elevation. The 14.7 psi standard is for sea level.

Q3: What's the difference between PSIG and PSIA?
A: PSIG measures pressure relative to atmospheric pressure, while PSIA includes atmospheric pressure.

Q4: Can PSIG be negative?
A: Yes, negative PSIG indicates vacuum conditions (pressure below atmospheric).

Q5: When should I use absolute vs gauge pressure?
A: Use absolute for scientific calculations, gauge for most industrial applications where atmospheric pressure is the reference.