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Standard Atmospheric Pressure:
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Atmospheric pressure is the force per unit area exerted on a surface by the weight of air above that surface in the atmosphere of Earth. It is typically measured in millimeters of mercury (mmHg).
The standard atmospheric pressure is defined as:
This value represents the average atmospheric pressure at sea level at a temperature of 15°C (59°F).
Details: Standard atmospheric pressure is used as a reference point in many scientific calculations, weather forecasting, aviation, and engineering applications. It serves as the baseline for pressure measurements in various fields.
Tips: Enter an atmospheric pressure value in mmHg to verify if it matches the standard value of 760 mmHg. The calculator will indicate whether your input represents standard atmospheric pressure.
Q1: Why is 760 mmHg considered standard?
A: This value was established as the average atmospheric pressure at sea level and has been internationally accepted as the standard reference for pressure measurements.
Q2: How does atmospheric pressure vary with altitude?
A: Atmospheric pressure decreases with increasing altitude as there is less air above measuring point. Pressure drops approximately 1 mmHg for every 10.5 meter increase in elevation.
Q3: What other units are used to measure atmospheric pressure?
A: Common units include atmospheres (atm), pascals (Pa), bars, and pounds per square inch (psi). 760 mmHg equals 1 atm, 101,325 Pa, 1.01325 bar, or 14.6959 psi.
Q4: How is atmospheric pressure measured?
A: Traditionally measured with mercury barometers, but modern instruments include aneroid barometers and digital pressure sensors.
Q5: Why does atmospheric pressure affect weather?
A: High pressure typically brings stable, clear weather, while low pressure is associated with clouds, precipitation, and storms as air rises and cools.