1. What is PSI to PSIA Conversion?

Definition: This calculator converts pressure from PSI (pounds per square inch gauge) to PSIA (pounds per square inch absolute).

Purpose: It helps engineers, technicians, and students convert between gauge pressure and absolute pressure measurements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• PSIA — Absolute pressure (includes atmospheric pressure)
• PSI — Gauge pressure (relative to atmospheric pressure)
• 14.7 — Standard atmospheric pressure at sea level (psi)

Explanation: Absolute pressure equals gauge pressure plus atmospheric pressure (approximately 14.7 psi at sea level).

3. Importance of PSI/PSIA Conversion

Details: Understanding the difference between gauge and absolute pressure is crucial for accurate pressure measurements in various engineering and scientific applications.

4. Using the Calculator

Tips: Simply enter the PSI (gauge pressure) value and the calculator will automatically compute the equivalent PSIA (absolute pressure).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between PSI and PSIA?
A: PSI is gauge pressure (relative to atmospheric pressure), while PSIA is absolute pressure (includes atmospheric pressure).

Q2: Why is 14.7 psi added to convert to PSIA?
A: This represents standard atmospheric pressure at sea level (1 atmosphere = 14.7 psi).

Q3: Does atmospheric pressure change with altitude?
A: Yes, atmospheric pressure decreases with altitude. The 14.7 psi value is for sea level.

Q4: When would I need PSIA instead of PSI?
A: PSIA is used in scientific calculations, vacuum measurements, and anywhere absolute pressure is required.

Q5: What is a vacuum in PSIA terms?
A: A perfect vacuum is 0 PSIA. Any pressure below 14.7 PSIA at sea level is considered a vacuum.