1. What is a Barometric Pressure to PSI Calculator?

Definition: This calculator converts barometric pressure from inches of mercury (inHg) to pounds per square inch (psi).

Purpose: It helps meteorologists, engineers, and aviation professionals convert between these common pressure units.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{psi} \) — Pressure in pounds per square inch (psi)
• \( P_{inHg} \) — Pressure in inches of mercury (inHg)
• 0.491154 — Conversion factor from inHg to psi

Explanation: Standard atmospheric pressure (29.92 inHg) equals approximately 14.6959 psi.

3. Importance of Pressure Conversion

Details: Accurate pressure conversion is essential for weather forecasting, aircraft performance calculations, and industrial processes.

4. Using the Calculator

Tips: Enter the barometric pressure in inches of mercury (inHg). The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the standard atmospheric pressure in psi?
A: Standard atmospheric pressure is 14.6959 psi, which equals 29.92 inHg.

Q2: Why is pressure measured in inches of mercury?
A: It originates from mercury barometers where atmospheric pressure pushes mercury up a tube.

Q3: Where is this conversion most commonly used?
A: Aviation, meteorology, and engineering applications frequently require this conversion.

Q4: How precise is the conversion factor?
A: The factor 0.491154 is derived from the density of mercury and standard gravity.

Q5: Can I convert psi back to inHg?
A: Yes, divide psi by 0.491154 to get inHg.