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Standard Atmospheric Pressure:
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Absolute barometric pressure, often referred to as standard atmospheric pressure, is the pressure exerted by the weight of the atmosphere at sea level. The standard value is 101,325 Pascals (Pa), which is equivalent to 1 atmosphere (atm), 760 mmHg, or 1013.25 millibars.
The calculator uses the standard atmospheric pressure formula:
Where:
Explanation: This value represents the average atmospheric pressure at sea level under standard conditions, which is used as a reference point in various scientific and engineering calculations.
Details: Absolute barometric pressure is crucial for meteorological forecasting, aviation altimetry, scuba diving calculations, industrial processes, and scientific research where precise pressure measurements are required.
Tips: Enter the pressure value in Pascals (Pa). The calculator will display the absolute barometric pressure. For standard conditions, the value is preset to 101325 Pa.
Q1: Why is 101325 Pa considered standard atmospheric pressure?
A: This value represents the average pressure at sea level at 15°C, established by international agreement as a standard reference point.
Q2: How does altitude affect barometric pressure?
A: Pressure decreases with increasing altitude approximately 1 hPa (100 Pa) for every 8 meters of elevation gain near sea level.
Q3: What instruments measure barometric pressure?
A: Barometers are used to measure atmospheric pressure, with mercury barometers, aneroid barometers, and digital barometers being common types.
Q4: How does weather affect barometric pressure?
A: High pressure typically indicates fair weather, while low pressure often signals stormy or rainy conditions.
Q5: What are other common units for atmospheric pressure?
A: Common units include atmospheres (atm), millimeters of mercury (mmHg), torr, pounds per square inch (psi), and millibars (mb).