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Air pressure is the force exerted by the weight of air above a specific point. It impacts weather patterns, flying, and even breathing.
The general formula to calculate air pressure is:
\[ P = \frac{F}{A} \]
For atmospheric pressure calculations, a specific formula is used:
\[ P = P_0 \times \left(1 - \frac{L \times h}{T_0}\right)^{\frac{g \times M}{R \times L}} \]
Use the Barometric Formula, considering temperature, altitude, and atmosphere composition.
The SI unit for pressure is the Pascal (Pa).
Air pressure at a specific altitude can be calculated using the Barometric Formula, which considers the temperature, altitude, and the composition of the Earth's atmosphere.
The basic formula for calculating pressure is \(P = \frac{F}{A}\), where \(P\) is pressure, \(F\) is force, and \(A\) is area. For atmospheric pressure, specific atmospheric models and formulas are applied.
At 25 km above sea level, the air pressure significantly drops compared to sea level. Precise values require atmospheric data but generally fall within low-pressure ranges.
Total air pressure is the sum of all partial pressures of gases that make up the Earth's atmosphere, measured at a specific location.
CFM (cubic feet per minute) is a measure of air flow, not pressure. Air pressure measurements are typically in units like Pascals or PSI.
Common units of pressure include Pascals (Pa), atmospheres (atm), and pounds per square inch (PSI).
High air pressure, or a high-pressure system, typically brings clear skies and calm weather. It's when the atmospheric pressure is above the average.
The symbol for pressure is typically \(P\).
The SI unit for pressure is the Pascal (Pa).
Using the ideal gas law, \(PV = nRT\), where \(P\) is pressure, \(V\) is volume, \(n\) is moles of gas, \(R\) is the gas constant, and \(T\) is temperature.
To calculate air pressure in a pipe, one must consider the flow rate, the diameter of the pipe, and the air's viscosity, usually through specific fluid dynamics equations.
Pressure is commonly measured in Pascals (Pa), but other units like PSI (pounds per square inch) and atmospheres (atm) are also used.
| Altitude above Sea Level | Absolute Atmospheric Pressure | ||||
|---|---|---|---|---|---|
| feet | miles | meters | kPa | atm | psia |
| -5000 | -0.95 | -1524 | 121.0 | 1.19 | 17.55 |
| -4000 | -0.76 | -1219 | 116.9 | 1.15 | 16.95 |
| -3000 | -0.57 | -914 | 112.8 | 1.11 | 16.36 |
| -2000 | -0.38 | -610 | 108.9 | 1.07 | 15.79 |
| -1000 | -0.19 | -305 | 105.0 | 1.04 | 15.24 |
| -500 | -0.09 | -152 | 103.2 | 1.02 | 14.96 |
| 0 | 0.00 | 0 | 101.3 | 1.00 | 14.70 |
| 500 | 0.09 | 152 | 99.5 | 0.98 | 14.43 |
| 1000 | 0.19 | 305 | 97.7 | 0.96 | 14.17 |
| 1500 | 0.28 | 457 | 96.0 | 0.95 | 13.92 |
| 2000 | 0.38 | 610 | 94.2 | 0.93 | 13.66 |
| 2500 | 0.47 | 762 | 92.5 | 0.91 | 13.42 |
| 3000 | 0.57 | 914 | 90.8 | 0.90 | 13.17 |
| 3500 | 0.66 | 1067 | 89.1 | 0.88 | 12.93 |
| 4000 | 0.76 | 1219 | 87.5 | 0.86 | 12.69 |
| 4500 | 0.85 | 1372 | 85.9 | 0.85 | 12.46 |
| 5000 | 0.95 | 1524 | 84.3 | 0.83 | 12.23 |
| 6000 | 1.14 | 1829 | 81.2 | 0.80 | 11.78 |
| 7000 | 1.33 | 2134 | 78.2 | 0.77 | 11.34 |
| 8000 | 1.52 | 2438 | 75.3 | 0.74 | 10.92 |
| 9000 | 1.70 | 2743 | 72.4 | 0.71 | 10.51 |
| 10000 | 1.89 | 3048 | 69.7 | 0.69 | 10.11 |
| 15000 | 2.84 | 4572 | 57.2 | 0.56 | 8.29 |
| 20000 | 3.79 | 6096 | 46.6 | 0.46 | 6.75 |
| 25000 | 4.73 | 7620 | 37.6 | 0.37 | 5.45 |
| 30000 | 5.68 | 9144 | 30.1 | 0.30 | 4.36 |
| 35000 | 6.63 | 10668 | 23.8 | 0.24 | 3.46 |
| 40000 | 7.58 | 12192 | 18.8 | 0.19 | 2.72 |
| 45000 | 8.52 | 13716 | 14.7 | 0.15 | 2.14 |
| 50000 | 9.47 | 15240 | 11.6 | 0.11 | 1.68 |
| 55000 | 10.42 | 16764 | 9.1 | 0.09 | 1.32 |
| 60000 | 11.36 | 18288 | 7.2 | 0.07 | 1.04 |
| 65000 | 12.31 | 19812 | 5.6 | 0.06 | 0.82 |