1. What is PSIA to PSIG Conversion?

PSIA (Pounds per Square Inch Absolute) to PSIG (Pounds per Square Inch Gauge) conversion is used to convert absolute pressure readings to gauge pressure readings by subtracting atmospheric pressure.

2. How Does the Calculator Work?

The calculator uses the conversion formula:

Where:

• \( PSIA \) — Absolute pressure in pounds per square inch
• \( PSIG \) — Gauge pressure in pounds per square inch
• \( 14.696 \) — Standard atmospheric pressure at sea level (psi)

Explanation: Gauge pressure represents pressure relative to atmospheric pressure, while absolute pressure includes atmospheric pressure.

3. Importance of Pressure Conversion

Details: Accurate pressure conversion is crucial for engineering applications, industrial processes, HVAC systems, and pneumatic controls where pressure measurements need to be standardized.

4. Using the Calculator

Tips: Enter absolute pressure in PSIA. The calculator will automatically convert it to PSIG by subtracting standard atmospheric pressure (14.696 psi).

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between PSIA and PSIG?
A: PSIA measures pressure relative to absolute vacuum, while PSIG measures pressure relative to atmospheric pressure.

Q2: Why subtract 14.696 psi?
A: This represents standard atmospheric pressure at sea level, which is the reference point for gauge pressure measurements.

Q3: Does atmospheric pressure change with altitude?
A: Yes, atmospheric pressure decreases with increasing altitude. The 14.696 value is for sea level conditions.

Q4: When would I need to convert PSIA to PSIG?
A: When working with pressure gauges that measure relative to atmospheric pressure, or when comparing pressure readings from different measurement systems.

Q5: Can PSIG be negative?
A: Yes, when the absolute pressure is less than atmospheric pressure, PSIG will be negative, indicating vacuum conditions.