1. What is an inHg to PSIA Calculator?

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

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula converts inHg to PSI using a conversion factor (0.491154) and adds standard atmospheric pressure (14.696 PSI) to give absolute pressure.

3. Importance of Pressure Conversion

Details: Accurate pressure conversion is crucial for applications like vacuum systems, meteorology, HVAC, 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 absolute pressure in PSIA.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between PSIA and PSIG?
A: PSIA is absolute pressure (relative to vacuum), while PSIG is gauge pressure (relative to atmospheric pressure). PSIA = PSIG + 14.696.

Q2: Why is 14.696 added in the formula?
A: This represents standard atmospheric pressure at sea level, converting from gauge to absolute pressure.

Q3: Where is inHg commonly used?
A: Inches of mercury is often used in meteorology, aviation, and vacuum measurements.

Q4: What's the conversion factor 0.491154?
A: This is the conversion factor from inHg to PSI (1 inHg = 0.491154 PSI).

Q5: Can this calculator handle negative values?
A: No, pressure values must be ≥ 0. For vacuum measurements, use positive values representing the vacuum level in inHg.