How to convert between pressure units?
Pressure is a fundamental measurement in mechanics, pneumatics, and hydraulics. Conversions between PSI (pounds per square inch), Bar, and Pascal are especially important in industrial and technical applications.
Conversion formulas:
1 PSI = 0.0689476 Bar
1 PSI = 6,894.76 Pascal
1 Bar = 14.5038 PSI
1 Bar = 100,000 Pascal
1 Pascal = 0.000145038 PSI
1 Pascal = 0.00001 Bar
Practical examples
Tire pressure:
35 PSI = 2.41 Bar
Calculation: 35 × 0.0689476 = 2.41 Bar
Hydraulic pressure:
5 Bar = 72.52 PSI
Calculation: 5 × 14.5038 = 72.52 PSI
Common reference values
| Item | PSI | Bar | Pascal |
|---|---|---|---|
| Car tire | 32-35 | 2.2-2.4 | 220,000-240,000 |
| Atmospheric pressure | 14.7 | 1.01 | 101,325 |
| Home compressor | 90-120 | 6.2-8.3 | 620,000-830,000 |
| Basic hydraulic system | 1,500 | 103.4 | 10,340,000 |
Common applications
- Automotive:
Tire pressure, hydraulic systems, and brake systems.
- Industrial:
Pneumatic systems, compressors, hydraulic equipment.
- HVAC:
Air conditioning and refrigeration systems.
- Laboratory:
Scientific measurements and process control.
Understanding the units
PSI (Pounds per Square Inch)
Common in English-speaking countries, especially for practical applications like tires and compressors.
Bar
Practical metric unit, approximately equal to atmospheric pressure. Common in Europe and industrial applications.
Pascal (Pa)
International System (SI) unit. One Pascal is one Newton of force per square meter. Primarily used in scientific contexts.
Conversion tips
- Bar to PSI: Multiply by 15 for a quick estimate.
- Pascal to Bar: Divide by 100,000 (or move decimal point 5 places).
- Precision: In critical applications like industrial hydraulic systems, always use exact values.
Safety note
Using correct measurements in pressure systems is crucial. A conversion error can lead to dangerous situations or equipment damage. Always verify units and manufacturer specifications.