1. What is PSIG to PSIA Conversion?

Definition: This calculator converts gauge pressure (PSIG) to absolute pressure (PSIA) by adding atmospheric pressure.

Purpose: It helps engineers, technicians, and students working with pressure measurements in various applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

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

3. Importance of Pressure Conversion

Details: Proper pressure conversion is essential for accurate calculations in thermodynamics, fluid mechanics, and various engineering applications where absolute pressure is required.

4. Using the Calculator

Tips: Simply enter the gauge pressure in PSIG. The calculator will automatically add 14.7 psi (standard atmospheric pressure) to give the absolute pressure in PSIA.

5. Frequently Asked Questions (FAQ)

Q1: Why is 14.7 psi used as atmospheric pressure?
A: This is the standard atmospheric pressure at sea level. Actual atmospheric pressure varies with altitude and weather conditions.

Q2: What's the difference between PSIG and PSIA?
A: PSIG measures pressure relative to atmospheric pressure, while PSIA measures pressure relative to a perfect vacuum.

Q3: When would I need to use PSIA instead of PSIG?
A: PSIA is used in scientific calculations, gas laws, and any application where absolute pressure is required (e.g., HVAC systems, thermodynamics).

Q4: Does this calculator work for negative PSIG values?
A: Yes, it works for vacuum pressures (negative PSIG values), which will result in PSIA values less than 14.7.

Q5: How does altitude affect the conversion?
A: At higher altitudes, atmospheric pressure is less than 14.7 psi. For precise calculations at altitude, use the local atmospheric pressure.