Pressure Conversion Table and Vacuum Terminology

Pressure Conversion Table and Vacuum Terminology

This table provides rapid access to pressure units, their mutual interconversion factors and vacuum ranges.

Vacuum Quality

Unit Symbol

Pascal Pa

105

Rough Vacuum

104

p r e s s u r e

103

100

Medium Vacuum

10

1

10-1

High Vacuum

10-2

10-3

10-4

10-5

Ultrahigh Vacuum

10-6

10-7

10-8

10-9

bar

millibar

bar

mbar

pounds per

square

Torr

millitorr

inch

Torr

mTorr

psi

1 0.1 0.01 0.001 10-4 10-5 10-6 10-7 10-8 10-9 10-10 10-11 10-12 10-13 10-14

1000 100 10 1 0.1 0.01 10-3 10-4 10-5 10-6 10-7 10-8 10-9 10-10 10-11

752 75.2 7.52 0.752 0.075 7.5x10-3 7.5x10-4 7.5x10-5 7.5x10-6 7.5x10-7 7.5x10-8 7.5x10-9 7.5x10-10 7.5x10-11 7.5x10-12

751880 75188 7519 752 75.2 7.52 0.752 0.075

7.5x10-3 7.5x10-4 7.5x10-5 7.5x10-6 7.5x10-7 7.5x10-8 7.5x10-9

14.5 1.45 0.145 0.015 1.5x10-3 1.5x10-4 1.5x10-5 1.5x10-6 1.5x10-7 1.5x10-8 1.5x10-9 1.5x10-10 1.5x10-11 1.5x10-12 1.5x10-13

? ms-

1 bar = 1000 mbar = 105 Pa 1 Torr = 133 Pa 1 psi = 6895 Pa = 68.95 mbar Useful ranges are in bold face.

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