1. What is PSIA to PSIG Conversion?

Definition: This calculator converts pressure measurements from absolute pressure (PSIA) to gauge pressure (PSIG).

Purpose: It helps engineers, technicians, and students work with pressure measurements in different systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• PSIG — Gauge pressure (pounds per square inch gauge)
• PSIA — Absolute pressure (pounds per square inch absolute)
• 14.7 — Standard atmospheric pressure at sea level (psi)

Explanation: Gauge pressure is the difference between absolute pressure and atmospheric pressure.

3. Importance of Pressure Conversion

Details: Proper pressure conversion ensures accurate measurements in systems like HVAC, pneumatic controls, and industrial processes.

4. Using the Calculator

Tips: Enter the absolute pressure (PSIA) value. The result will show the equivalent gauge pressure (PSIG).

5. Frequently Asked Questions (FAQ)

Q1: Why subtract 14.7 psi?
A: This accounts for standard atmospheric pressure at sea level that affects gauge measurements.

Q2: What if my elevation is not sea level?
A: For higher elevations, use local atmospheric pressure instead of 14.7 psi.

Q3: Can PSIG be negative?
A: Yes, when PSIA is less than 14.7, indicating vacuum conditions.

Q4: What's the difference between PSIA and PSIG?
A: PSIA includes atmospheric pressure while PSIG measures pressure relative to atmosphere.

Q5: Where is this conversion most used?
A: In compressed air systems, pressure vessel design, and anywhere pressure measurements are critical.