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Pressure Vacuum

mbar (hPa)

bar

Pa (N/m2)

KPa

atm

Kgf cm -2(at)

mm H2O

Torr (mm Hg)

micron

in Hg

in H2O

lbfin-2 (psi)

1 mbar

1x10-3

102

0.1

9.869x10-4

1.02x10-3

10.197

0.75

750

2.953x10-2

0.402

1.45x10-2

1 bar

103

1x105

100

0.987

1.02

1.02x104

7.5x102

7.5x105

29.53

4.015x102

14.5

1 Pa (N/m2)

0.01

1x10-5

0.001

9.869x10-6

1.02x10-5

0.102

7.5x10-3

7.5

2.953x10-4

4.015x10-3

1.45x10-4

1 KPa

0.01

103

9.869x10-3

1.02x10-2

1.02x102

7.5

7.5x103

0.295

4.015

0.145

1 atm

1.013x103

1.013

1.013x105

1.013x102

1.033

1.033x104

7.6x102

7.6x105

29.92

4.068x102

14.7

1 Kgfcm-2(at)

9.807x102

0.981

9.807x104

98.07

0.968

104

7.356x102

7.356x105

28.96

3.937 x 102

14.22

1 mm H2O

9.807x10-2

9.807x10-5

9.807

9.807x10-3

9.677x10-5

10-4

7.354x10-2

73.54

2.896x10-3

3.394x10-2

1.42x10-3

1 Torr (mm Hg)

1.333

1.333x10-3

1.333x102

1.333x10-1

1.316x10-3

1.36x10-3

13.59

103

3.937x10-2

0.535

1.934x10-2

1 micron

1.333x10-3

1.333x10-6

1.333x10-1

1.333x10-4

1.316x10-6

1.36x10-6

1.359x10-2

10-3

3.937x10-5

5.35x10-4

1.934x10-5

1 in Hg

33.86

3.386x10-2

3.386x103

3.386

3.342x10-2

3.453x10-2

3.45x102

25.4

2.54x104

13.6

0.491

1 in H2O

2.491

2.491x10-3

2.491x102

0.249

2.458x10-3

2.54 x 10-3

25.4

1.868

1.868X103

7.356x10-2

3.613x10-2

1 lbfin-2 (psi)

68.95

6.895x10-2

6.895x103

6.895

6.805x10-2

7.03x10-2

7.03x102

51.71

5.171x104

2.036

27.68

Vacuum Conversion : Absolute pressure p (mbar abs.) can be converted to & from pressure difference DP (inches Hg) based on atmospheric pressure of 1013 mbar abs. (= 760 Torr = 29.92 inches Hg abs.) using the followng formula : 29.92 - 2.953X10-2 Xp(mbar abs) = Dp (inches Hg) ; 1013-33.86 X Dp (inches Hg) = p (mbar abs.)