Convert between standard atmosphere (atm) and pounds per square inch (psi) for pressure measurements — 1 atm ≈ 14.6959487755 psi.
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Pressure Unit Conversion:
1 Standard Atmosphere (atm) ≈ 14.6959487755 Pounds per Square Inch (psi) | 1 psi ≈ 0.068046 atm
psi = atm × 14.6959487755 | atm = psi × 0.068046 (Results shown with 4 decimal places)
*Derived from: 1 atm = 101325 Pa; 1 psi ≈ 6894.76 Pa (101325 ÷ 6894.76 ≈ 14.6959487755)
Standard atmosphere — reference pressure (sea level), used in meteorology, engineering
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Understanding pressure units for meteorology, engineering, and everyday applications.
| Unit | Symbol | Equivalent in Pascals (Pa) | Common Uses |
|---|---|---|---|
| Standard Atmosphere | atm | 101325 Pa (exact) | Meteorology (weather reports), scientific reference, altitude pressure calculations |
| Pounds per Square Inch | psi | ≈ 6894.76 Pa | Engineering (pipes, pressure vessels), automotive (tire pressure), hydraulics, industrial equipment |
| Standard Atmosphere (atm) | ≈ | Psi | Real-World Example |
|---|---|---|---|
| 0.5 atm | ≈ | 7.3479 psi | Atmospheric pressure at ~5,500m altitude (mountains) |
| 1 atm | ≈ | 14.6959487755 psi | Sea level atmospheric pressure (standard reference) |
| 1.013 atm | ≈ | 14.8900 psi | Typical car tire pressure (cold) |
| 2 atm | ≈ | 29.3918 psi | Water pressure at ~10m depth (diving) |
| 3 atm | ≈ | 44.0878 psi | Standard pressure in some industrial hydraulic systems |
About standard atmosphere, psi, and pressure unit conversions
The relationship is derived from the definition of both units in terms of Pascals (Pa), the SI unit of pressure:
1 atm = 101325 Pa (exact)
1 psi ≈ 6894.76 Pa
1 atm to psi: 101325 ÷ 6894.76 ≈ 14.6959487755
1 psi to atm: 6894.76 ÷ 101325 ≈ 0.068046
The choice depends on the application context and regional conventions:
Regional note: Psi is dominant in the United States for industrial and consumer applications, while atm is used globally as a scientific reference. Both are converted to Pascals (Pa) for SI-compliant engineering.
All pressure units can be converted through their Pascal equivalents:
1 atm = 1.01325 bar = 101.325 kPa = 14.6959487755 psi
1 bar = 0.9869 atm = 100 kPa = 14.5038 psi
1 kPa = 0.00987 atm = 0.01 bar = 0.1450 psi
1 psi = 0.0680 atm = 0.0689 bar = 6.8948 kPa
Practical examples of cross-unit conversion:
This converter focuses on atm↔psi, but the same Pascal-based logic applies when converting to other pressure units.
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