Convertissez psi en bar, bar en psi, kPa, atm, hPa, mmHg et inHg pour les pneus, la météo et la tension artérielle, avec une chaîne de facteurs exacte.
Les deux unités sont définies exactement, mais la valeur convertie est une décimale périodique ; elle est affichée avec 12 chiffres significatifs.
À propos de Convertisseur de pression
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.
Exemples détaillés
32 psi tyre pressure in bar
Valeur
32 psi
De
pound per square inch (psi)
Vers
bar
Valeur convertie
2.2063223338 bar
Source de vérification : 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)
1 atm in psi
Valeur
1 atm
De
standard atmosphere (atm)
Vers
pound per square inch (psi)
Valeur convertie
14.6959487755 psi
Source de vérification : 101325 Pa ÷ 6894.757293168… Pa (Python 3.8 fractions from the legal definitions)
760 torr is 1 atm
Valeur
760 Torr
De
torr (Torr)
Vers
standard atmosphere (atm)
Valeur convertie
1 atm
Exactitude
Exact
Source de vérification : 1 torr = 101325/760 Pa by definition (NIST SP 811 App. B)
1 inHg (conventional value)
Valeur
1 inHg
De
inch of mercury (inHg)
Vers
pascal (Pa)
Valeur convertie
3,386.389 Pa
Exactitude
Approximatif
Source de vérification : NIST SP 811 App. B.9: inch of mercury (0 °C) = 3.386389 E+03 Pa
Questions
How do I convert psi to bar?
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.
Is 1 bar the same as 1 atmosphere?
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.
What is the difference between psig and psia?
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.
Are mmHg and torr the same?
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.
How do I convert inches of mercury to hPa?
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.
Quelle est la précision de « Convertisseur de pression » ?
La précision dépend de vos données et des hypothèses de la méthode. Le calcul décimal utilise 50 chiffres significatifs, mais les estimations, méthodes numériques et données sources peuvent être moins précises ; l’arrondi affiché ne supprime pas ces limites. Exemples résolus vérifiés à partir de sources indépendantes : 4. Par exemple, « 32 psi tyre pressure in bar » est vérifié à l’aide de 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).
D’où vient cette méthode ?
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.
À propos de ce calculateur
xto=xfrom×ftoffromf=one unit expressed in Pa
Ce calculateur comprend 4 exemples résolus dont les réponses proviennent de sources indépendantes. Ils font partie de la suite de tests et peuvent aussi être exécutés ici.