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Pressure Formula:
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Pressure is defined as the force applied perpendicular to the surface of an object per unit area. In physics, air pressure specifically refers to the pressure exerted by the weight of air in the atmosphere.
The calculator uses the fundamental pressure formula:
Where:
Explanation: This formula shows that pressure is directly proportional to the applied force and inversely proportional to the area over which the force is distributed.
Details: Pressure calculations are essential in various physics applications including fluid dynamics, aerodynamics, meteorology, and engineering design. Understanding pressure helps in predicting weather patterns, designing hydraulic systems, and studying atmospheric phenomena.
Tips: Enter force in Newtons (N) and area in square meters (m²). Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is the SI unit for pressure?
A: The SI unit for pressure is the Pascal (Pa), which is equivalent to one Newton per square meter (N/m²).
Q2: How does air pressure vary with altitude?
A: Air pressure decreases with increasing altitude because there is less air above exerting downward force.
Q3: What is atmospheric pressure at sea level?
A: Standard atmospheric pressure at sea level is approximately 101,325 Pascals or 101.325 kPa.
Q4: How is pressure measured in different systems?
A: Pressure can be measured in various units including Pascals, atmospheres, bars, psi (pounds per square inch), and torr, with conversion factors between them.
Q5: What is gauge pressure vs absolute pressure?
A: Gauge pressure is measured relative to atmospheric pressure, while absolute pressure is measured relative to a perfect vacuum. Absolute pressure = Gauge pressure + Atmospheric pressure.