PSIA to PA
Convert psia into pascals for gauges, specs, hydraulic notes, and pressure reference checks.
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PSIA to PA Table
| PSIA | Pascals |
|---|---|
| 1 | 6,894.757293 |
| 5 | 34,473.786465 |
| 10 | 68,947.57293 |
| 25 | 172,368.932325 |
| 50 | 344,737.86465 |
| 100 | 689,475.7293 |
| 250 | 1.72369E+6 |
| 500 | 3.44738E+6 |
| 1,000 | 6.89476E+6 |
| 2,500 | 1.72369E+7 |
Popular Conversions
- 1 psia = 6,894.757293 pascals
- 5 psia = 34,473.786465 pascals
- 10 psia = 68,947.57293 pascals
- 25 psia = 172,368.932325 pascals
- 50 psia = 344,737.86465 pascals
- 100 psia = 689,475.7293 pascals
- 250 psia = 1.72369E+6 pascals
- 500 psia = 3.44738E+6 pascals
What is PSIA and Pascal?
PSIA
Definition: PSIA means pounds per square inch absolute and includes atmospheric pressure in the reading.
History/origin: Absolute-pressure notation became important once engineers needed to distinguish total pressure from gauge-only readings.
Current use: PSIA is used in thermodynamics, compressor work, gas laws, and sealed-system analysis.
Pascal
Definition: A pascal is the SI unit of pressure and equals one newton per square meter.
History/origin: It was adopted with SI to unify pressure and stress measurement in one coherent system.
Current use: Pascals are used in science, engineering formulas, acoustics, and structural stress calculations.
Related Pressure Conversions
Pressure values are commonly translated across SI, customary, and fluid-column units in the same job.
| Related Conversion | Factor or Rule | Formula |
|---|---|---|
| mmHg to kPa | × 0.133322387 | kPa = mmHg × 0.133322387 |
| MPa to psi | × 145.037738 | psi = MPa × 145.037738 |
| Pa to kPa | ÷ 1,000 | kPa = Pa ÷ 1,000 |
| Pa to psi | × 0.000145037738 | psi = Pa × 0.000145037738 |
| psi to bar | × 0.068947573 | bar = psi × 0.068947573 |
| psi to mmHg | × 51.714933 | mmHg = psi × 51.714933 |
| psia to psig | minus atmosphere | psig = psia – atmospheric pressure |
| psig to psia | plus atmosphere | psia = psig + atmospheric pressure |
Typical Use Cases
Frequently Asked Questions
Q: What is the difference between PSIG and PSIA?
A: PSIG is gauge pressure measured relative to atmospheric pressure, while PSIA is absolute pressure measured from a vacuum reference. That is why the two numbers are not interchangeable even before any other unit change is applied.
Q: What is a useful checkpoint for PSIA to PA?
A: 1 psia equals 6,894.757293 pascals, which is a practical reference when checking a gauge reading against an absolute-pressure calculation.
Q: Why does atmospheric pressure matter on these pages?
A: Because one scale includes the surrounding atmospheric pressure and the other does not. The zero point is different, so the converted number changes accordingly.
Q: When do engineers need PSIG and PSIA conversions?
A: They come up in compressors, vacuum systems, thermodynamic calculations, pressure vessels, process equipment, and any worksheet that mixes gauge and absolute pressure.
Q: How do I convert Pascals back into PSIA?
A: psia = Pa ÷ 6,894.757293. Use the reverse rule carefully so the gauge-versus-absolute reference stays consistent.
Q: Is this exact?
A: The calculation uses an exact factor.