1. What is an inHg to psig Calculator?

Definition: This calculator converts pressure measurements from inches of mercury (inHg) to pounds per square inch gauge (psig).

Purpose: It helps engineers, technicians, and scientists convert between these common pressure units used in various industrial and scientific applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{PSIG} \) — Pressure in pounds per square inch gauge
• \( \text{P}_{\text{inHg}} \) — Pressure in inches of mercury

Explanation: The formula converts inHg to absolute pressure (psia) then subtracts atmospheric pressure (14.696 psi) to get gauge pressure.

3. Importance of Pressure Unit Conversion

Details: Accurate pressure conversion is crucial in fields like HVAC, meteorology, aviation, and industrial processes where different pressure units are used.

4. Using the Calculator

Tips: Simply enter the pressure value in inches of mercury (inHg) and the calculator will provide the equivalent in psig.

5. Frequently Asked Questions (FAQ)

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

Q2: Why subtract 14.696 in the formula?
A: This accounts for standard atmospheric pressure at sea level, converting absolute to gauge pressure.

Q3: What are typical applications for this conversion?
A: Used in barometric pressure measurements, vacuum systems, and pressure vessel specifications.

Q4: How accurate is this conversion?
A: Very accurate for standard conditions. For high precision applications, consider local atmospheric pressure.

Q5: Can I convert negative psig values?
A: Yes, negative psig represents vacuum conditions (pressure below atmospheric).