1. What is PSIG to PSIA Conversion?

The PSIG to PSIA conversion is used to convert gauge pressure (PSIG) to absolute pressure (PSIA). Gauge pressure is measured relative to atmospheric pressure, while absolute pressure is measured relative to a perfect vacuum.

2. How Does the Calculator Work?

The calculator uses the simple conversion formula:

Where:

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

Explanation: This formula converts gauge pressure (which excludes atmospheric pressure) to absolute pressure (which includes atmospheric pressure).

3. Importance of Pressure Conversion

Details: Accurate pressure conversion is crucial for engineering calculations, fluid dynamics, HVAC systems, and various industrial applications where absolute pressure measurements are required.

4. Using the Calculator

Tips: Enter the PSIG value in the input field. The calculator will automatically compute the corresponding PSIA value. The result is displayed with four decimal places for precision.

5. Frequently Asked Questions (FAQ)

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

Q2: Why is 14.696 used in the conversion?
A: This represents standard atmospheric pressure at sea level (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 conditions.

Q4: When should I use absolute pressure vs gauge pressure?
A: Use absolute pressure for scientific calculations, vacuum systems, and thermodynamic equations. Use gauge pressure for most industrial and mechanical applications.

Q5: Can this calculator be used for negative gauge pressures?
A: Yes, the calculator works for both positive and negative PSIG values (vacuum conditions).