In Hg To Psig Calculator

Conversion Formula:

\[ psig = (inHg \times 0.491154) - 14.696 \]

Pounds per Square Inch Gauge (psig):

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1. What is In Hg To Psig Conversion?

The In Hg to Psig conversion calculates pounds per square inch gauge pressure from inches of mercury measurement. This conversion is essential in various engineering and scientific applications where pressure measurements need to be converted between different units.

2. How Does the Calculator Work?

The calculator uses the conversion formula:

\[ psig = (inHg \times 0.491154) - 14.696 \]

Where:

\( inHg \) — Inches of mercury
\( 0.491154 \) — Conversion factor (psi/inHg)
\( 14.696 \) — Atmospheric pressure in psi
\( psig \) — Pounds per square inch gauge

Explanation: The formula converts inches of mercury to absolute pressure first, then subtracts atmospheric pressure to obtain gauge pressure.

3. Importance of Pressure Conversion

Details: Accurate pressure conversion is crucial for engineering calculations, HVAC systems, meteorological measurements, and industrial processes where different pressure units are used interchangeably.

4. Using the Calculator

Tips: Enter inches of mercury value in the input field. The value must be greater than 0. The calculator will automatically compute and display the equivalent psig value.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between psig and psia?
A: Psig is gauge pressure (relative to atmospheric pressure), while psia is absolute pressure (relative to perfect vacuum). Psig = Psia - Atmospheric Pressure.

Q2: Why subtract 14.696 in the formula?
A: 14.696 psi represents standard atmospheric pressure at sea level, which is subtracted to convert from absolute pressure to gauge pressure.

Q3: Where is inches of mercury commonly used?
A: Inches of mercury is commonly used in meteorology for barometric pressure, in aviation for altimeter settings, and in some industrial vacuum measurements.

Q4: What is the accuracy of this conversion?
A: The conversion uses standard atmospheric pressure and conversion factors. For precise scientific work, local atmospheric pressure should be used instead of 14.696.

Q5: Can this calculator handle negative pressure values?
A: The calculator accepts positive values only. For vacuum measurements (negative gauge pressure), specialized vacuum conversion formulas should be used.