Converti psi in bar, bar in psi, kPa, atm, hPa, mmHg e inHg per le letture di pneumatici, meteo e pressione sanguigna, con la catena esatta dei fattori.
Aggiornato Esempi verificati: 4
32 psi equivale a circa 2.206322 bar. Un’unità di libbra per pollice quadrato equivale a circa 0.06894757 bar.
| Unità | Valore | Definizione |
|---|---|---|
| pascal (Pa) | 220,632.2 | Unità di base |
| hectopascal (hPa) | 2,206.322 | 1 hPa = 100 Pa, esatto |
| chilopascal (kPa) | 220.6322 | 1 kPa = 1,000 Pa, esatto |
| megapascal (MPa) | 0.2206322 | 1 MPa = 1,000,000 Pa, esatto |
| bar | 2.206322 | 1 bar = 100,000 Pa, esatto |
| standard atmosphere (atm) | 2.177471 | 1 atm = 101,325 Pa, esatto |
| libbra per pollice quadrato (psi) | 32 | 1 psi = 4.4482216152605/0.00064516 Pa, esatto |
| millimetre of mercury (mmHg) | 1,654.878 | 1 mmHg = 133.322387415 Pa, esatto |
| torr (Torr) | 1,654.878 | 1 Torr = 101,325/760 Pa, esatto |
| inch of mercury (inHg) | 65.15265 | 1 inHg = 3,386.389 Pa, approssimato (Valore convenzionale a 0 °C) |
| kilogram-force per cm² (kgf/cm²) | 2.249823 | 1 kgf/cm² = 98,066.5 Pa, esatto |
1 psi = 4.4482216152605/0.00064516 Pa, esatto
1 bar = 100,000 Pa, esatto
Entrambe le unità sono definite esattamente, ma il valore convertito è un decimale periodico; viene mostrato con 12 cifre significative.
Each pressure unit is a fixed number of pascals (newtons per square metre). The bar is exactly 100,000 Pa, the standard atmosphere 101,325 Pa and the torr 1/760 atm. The psi, one pound-force per square inch, is about 6,894.757 Pa, fixed exactly by the 1959 pound, standard gravity (9.80665 m/s²) and the 25.4 mm inch.
The default converts a 32 psi tyre pressure to 2.2063 bar. Weather maps use hectopascals (1 hPa = 1 mbar; standard sea-level pressure is 1,013.25 hPa), and blood pressure is recorded in millimetres of mercury.
Gauge and absolute readings convert with the same factor but are not interchangeable: a tyre gauge shows pressure above the surrounding air, so 32 psi on the gauge is about 46.7 psi absolute at sea level. The inch of mercury uses the conventional value at 0 °C and is marked approximate.
Fonte di verifica: 1 psi = 4.4482216152605 N ÷ (0.0254 m)² (NIST SP 811 App. B); 32 psi = 8896443230521/4032250000000 bar (Python 3.8 fractions from the legal definitions)
Fonte di verifica: 101325 Pa ÷ 6894.757293168… Pa (Python 3.8 fractions from the legal definitions)
Fonte di verifica: 1 torr = 101325/760 Pa by definition (NIST SP 811 App. B)
Fonte di verifica: NIST SP 811 App. B.9: inch of mercury (0 °C) = 3.386389 E+03 Pa
Divide by 14.5038, or multiply by 0.0689476. A bar is 100,000 Pa and a psi 6,894.757 Pa, so 1 bar = 14.5038 psi. A 32 psi tyre is 2.2063 bar, and a 2.5 bar tyre is 36.26 psi.
No, though they are within 1.3%. The bar is exactly 100,000 Pa, while the standard atmosphere is exactly 101,325 Pa, which is 1.01325 bar, 14.696 psi or 760 mmHg. The atmosphere was set to match average sea-level air pressure, which is why weather charts centre on 1,013.25 hPa.
psig is gauge pressure, measured relative to the surrounding air; psia is absolute pressure, measured from a vacuum. At sea level psia = psig + 14.696. Tyre and compressor gauges read psig, so a flat tyre shows 0 psig while still holding 14.7 psia of air. The converter treats both alike, so keep input and output the same kind.
Almost. A torr is exactly 1/760 of a standard atmosphere, 133.322368 Pa, while the conventional millimetre of mercury is 133.322387415 Pa; they differ by about 0.14 parts per million. For blood pressure the difference never matters: 120/80 mmHg is 16.0/10.7 kPa either way.
Multiply by 33.8639: 29.92 inHg is 1,013.2 hPa, the standard altimeter setting in US aviation. This converter uses the conventional inch of mercury at 0 °C, 3,386.389 Pa (NIST SP 811), and marks results that use it as approximate because mercury's density changes with temperature.
La precisione dipende dai dati inseriti e dalle ipotesi del metodo. Il calcolo decimale usa 50 cifre significative, ma stime, metodi numerici e dati di origine possono essere meno precisi; l’arrotondamento visualizzato non elimina questi limiti. Esempi svolti verificati con fonti indipendenti: 4. Per esempio, «32 psi tyre pressure in bar» viene verificato con 1 psi = 4.4482216152605 N ÷ (0.0254 m)² (NIST SP 811 App. B); 32 psi = 8896443230521/4032250000000 bar (Python 3.8 fractions from the legal definitions).
NIST SP 811 (2008), Guide for the Use of the SI, Appendix B — conversion factors; NIST Handbook 44, Appendix C — General tables of units of measurement.
Questa calcolatrice include 4 esempi svolti con risposte da fonti indipendenti. Fanno parte della suite di test e puoi eseguirli anche qui.
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