Atmosphere (unit)
Pressure units and equivalencies
A pressure of 1 atm can also be stated as: ≡ 1.01325 bar ≡ 101325 pascals (Pa) or 101.325 kilopascals (kPa) ≡ 1013.25 millibars (mbar or mb) ≡ 760 torr (Torr) ≈ 760.001 mmHg, 0 °C, subject to revision as more precise measurements of mercury’s density become available ≈ 29.9213 inHg, 0 °C, subject to revision as more precise measurements of mercury’s density become available ≈ 1.033227452799886 kgf/cm² ≈ 1.033227452799886 technical atmosphere ≈ 1033.227452799886 cm H₂O, 4 °C ≈ 406.7824617322385 in H₂O, 4 °C ≈ 14.6959487755134 pounds-force per square inch (psi) ≈ 2116.21662367394 pounds-force per square foot (psf) = 1 ata (atmosphere absolute).

Atmosphere (unit)

Section Title: Pressure units and equivalencies
Table Section Text: A pressure of 1 atm can also be stated as: ≡ 1.01325 bar ≡ 101325 pascals (Pa) or 101.325 kilopascals (kPa) ≡ 1013.25 millibars (mbar or mb) ≡ 760 torr (Torr) ≈ 760.001 mmHg, 0 °C, subject to revision as more precise measurements of mercury’s density become available ≈ 29.9213 inHg, 0 °C, subject to revision as more precise measurements of mercury’s density become available ≈ 1.033227452799886 kgf/cm² ≈ 1.033227452799886 technical atmosphere ≈ 1033.227452799886 cm H₂O, 4 °C ≈ 406.7824617322385 in H₂O, 4 °C ≈ 14.6959487755134 pounds-force per square inch (psi) ≈ 2116.21662367394 pounds-force per square foot (psf) = 1 ata (atmosphere absolute).

vte	Pascal	Bar	Technical atmosphere	Standard atmosphere	Torr	Pounds per square inch

(Pa)	(bar)	(at)	(atm)	(Torr)	(lbf/in2)

1 Pa	≡ 1 N/m2	10−5	1.0197×10−5	9.8692×10−6	7.5006×10−3	0.000 145 037 737 730

1 bar	105	≡ 100 kPa ≡ 106 dyn/cm2	1.0197	0.98692	750.06	14.503 773 773 022

1 at	98066.5	0.980665	≡ 1 kgf/cm2	0.967 841 105 354 1	735.559 240 1	14.223 343 307 120 3

1 atm	101325	1.01325	1.0332	1	760	14.695 948 775 514 2

1 Torr	133.322 368 421	0.001 333 224	0.001 359 51	1/760 ≈ 0.001 315 789	1 Torr ≈ 1 mmHg	0.019 336 775

1 lbf/in2	6894.757 293 168	0.068 947 573	0.070 306 958	0.068 045 964	51.714 932 572	≡ 1 lbf/in2

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