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

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 must be properly interpreted.

4. Using the Calculator

Tips: Enter absolute pressure in PSIA. The value must be greater than 0. The calculator will automatically convert to PSIG by subtracting standard atmospheric pressure.

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 is 14.696 used for atmospheric pressure?
A: This represents standard atmospheric pressure at sea level under standard conditions (14.696 psi or 101.325 kPa).

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

Q4: When would I need to convert PSIA to PSIG?
A: When working with pressure gauges that measure relative to atmospheric pressure, or when interpreting absolute pressure readings in gauge pressure terms.

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