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Absolute Pressure Formula:
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The Absolute Pressure Formula calculates the total pressure exerted on a system, including both gauge pressure and atmospheric pressure. It represents the true pressure relative to a perfect vacuum.
The calculator uses the absolute pressure formula:
Where:
Explanation: Absolute pressure is the sum of gauge pressure (measured pressure relative to atmospheric pressure) and atmospheric pressure (typically 14.7 psi at sea level).
Details: Absolute pressure is crucial in various engineering applications, including fluid dynamics, HVAC systems, vacuum technology, and process control where accurate pressure measurements relative to absolute zero are required.
Tips: Enter gauge pressure in psi and atmospheric pressure in psi. Standard atmospheric pressure at sea level is 14.7 psi, but this may vary with altitude and weather conditions.
Q1: What is the difference between absolute and gauge pressure?
A: Gauge pressure measures pressure relative to atmospheric pressure, while absolute pressure measures pressure relative to a perfect vacuum (absolute zero).
Q2: Why is atmospheric pressure typically 14.7 psi?
A: This is the standard atmospheric pressure at sea level under normal conditions, representing the weight of the air column above.
Q3: How does altitude affect atmospheric pressure?
A: Atmospheric pressure decreases with increasing altitude as there is less air above. At higher elevations, atmospheric pressure is lower than 14.7 psi.
Q4: When should I use absolute pressure instead of gauge pressure?
A: Use absolute pressure for scientific calculations, vacuum systems, weather reporting, and any application where you need pressure relative to absolute zero.
Q5: Can absolute pressure be negative?
A: No, absolute pressure cannot be negative since it's measured relative to a perfect vacuum. The lowest possible absolute pressure is zero (perfect vacuum).