1. What is a PSIG to PSI Conversion Calculator?

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

Purpose: It helps engineers, technicians, and students working with pressure measurements understand the relationship between gauge and absolute pressure.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{PSI} \) — 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.

4. Using the Calculator

Tips: Simply enter the gauge pressure value in PSIG. The calculator will automatically add 14.7 psi to convert to absolute pressure.

5. Frequently Asked Questions (FAQ)

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

Q2: Why is 14.7 psi used for atmospheric pressure?
A: This is the standard atmospheric pressure at sea level. Actual atmospheric pressure varies with altitude and weather conditions.

Q3: When would I need to make this conversion?
A: When working with equations that require absolute pressure (like gas laws) or when comparing pressure readings from different systems.

Q4: What about negative PSIG values?
A: Negative PSIG indicates vacuum conditions. The calculator still works, resulting in PSI values below atmospheric pressure.

Q5: Is this conversion temperature-dependent?
A: The 14.7 psi standard is for 59°F (15°C). For precise scientific work at different temperatures, more complex calculations may be needed.