1. What is a Hg to PSI Calculator?

Definition: This calculator converts pressure measurements from inches of mercury (Hg) to pounds per square inch (PSI).

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( PSI \) — Pounds per square inch
• \( Hg \) — Inches of mercury

Explanation: The conversion factor 0.491154 comes from the standard atmospheric pressure definitions (1 atm = 29.92 inHg = 14.6959 psi).

3. Importance of Pressure Unit Conversion

Details: Accurate pressure conversions are essential in fields like meteorology, aviation, HVAC systems, and industrial processes where different units are standard.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is mercury (Hg) used to measure pressure?
A: Mercury's high density makes it ideal for barometers, as it requires shorter columns than other liquids to measure atmospheric pressure.

Q2: What's the standard atmospheric pressure in these units?
A: Standard atmospheric pressure is 29.92 inHg or 14.6959 psi at sea level.

Q3: How precise is this conversion?
A: The conversion factor is accurate to six decimal places, sufficient for most practical applications.

Q4: Where is this conversion commonly used?
A: Common in aviation (altimeter settings), vacuum systems, and barometric pressure measurements.

Q5: Can I convert PSI back to inHg?
A: Yes, use the inverse formula: Hg = PSI / 0.491154.