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The conversion from inches of mercury (inHg) to pounds per square inch absolute (PSIA) is a fundamental pressure unit conversion used in various scientific, engineering, and meteorological applications to translate between different pressure measurement systems.
The calculator uses the conversion formula:
Where:
Explanation: This conversion factor is derived from the relationship between mercury column height and absolute pressure, accounting for standard gravity and mercury density.
Details: Accurate pressure unit conversion is essential for engineering calculations, weather forecasting, aviation, industrial processes, and scientific research where different pressure measurement systems are used.
Tips: Enter the pressure value in inches of mercury (inHg). The value must be positive and valid. The calculator will automatically convert it to pounds per square inch absolute (PSIA).
Q1: What is the difference between PSIA and PSIG?
A: PSIA is absolute pressure measured relative to perfect vacuum, while PSIG is gauge pressure measured relative to atmospheric pressure. PSIA = PSIG + atmospheric pressure.
Q2: 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.
Q3: What is the standard atmospheric pressure in these units?
A: Standard atmospheric pressure is approximately 29.92 inHg or 14.696 PSIA at sea level.
Q4: How accurate is this conversion?
A: The conversion factor 0.491154 is based on standard conditions and provides high accuracy for most practical applications.
Q5: Can this calculator be used for vacuum pressure conversions?
A: Yes, this calculator can convert vacuum pressures expressed in inches of mercury to PSIA, which is particularly useful for vacuum system specifications.