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Tables and Charts
Conversion Factors
Pressure
-
Pumping Speed
-
Throughput
-
Outgassing
-
Weights and Measures
Converting Pressure
To Convert
Into
Multiply
atmosphere
bar
1.01295
atmosphere
dynes/cm
2
1.01295 x 10
6
atmosphere
in. Hg
29.9213
atmosphere
in. water
406.86
atmosphere
kg/cm
2
1.03325
atmosphere
mbar
1012.95
atmosphere
mtorr or micron Hg
7.6 x 10
5
atmosphere
Pa or N/m
2
1.01295 x 10
5
atmosphere
psi or lb/in
2
14.696
atmosphere
torr or mm Hg
760.00
bar
atmosphere
0.9872
bar
dynes/cm
2
1 x 10
6
bar
in. Hg
29.54
bar
in. water
401.65
bar
kg/cm
2
1.0200
bar
mbar
1000
bar
mtorr or micron Hg
7.5028 x 10
5
bar
Pa or N/m
2
1 x 10
5
bar
psi or lb/in
2
14.508
bar
torr or mm Hg
750.2838
dynes/cm
2
atmosphere
9.872 x 10
-7
dynes/cm
2
bar
1 x 10
-6
dynes/cm
2
in. Hg
2.954 x 10
-5
dynes/cm
2
in. water
4.0165 x 10
-4
dynes/cm
2
kg/cm
2
1.0200 x 10
-6
dynes/cm
2
mbar
1 x 10
-3
dynes/cm
2
mtorr or micron Hg
0.75028
dynes/cm
2
Pa or N/m
2
0.1
dynes/cm
2
psi or lb/in
2
1.4508 x 10
-5
dynes/cm
2
torr or mm Hg
7.5028 x 10
-4
in. Hg
atmosphere
3.342 x 10
-2
in. Hg
bar
3.385 x 10
-2
in. Hg
dynes/cm
2
3.385 x 10
4
in. Hg
in. water
13.598
in. Hg
kg/cm
2
3.4532 x 10
-2
in. Hg
mbar
33.85
in. Hg
mtorr or micron Hg
2.54 x 10
4
in. Hg
Pa or N/m
2
3385
in. Hg
psi or lb/in
2
0.4912
in. Hg
torr or mm Hg
25.4
in. water
atmosphere
2.458 x 10
-3
in. water
bar
2.489 x 10
-3
in. water
dynes/cm
2
2.489 x 10
3
in. water
kg/cm
2
2.5396 x 10
-3
in. water
in. Hg
7.354 x 10
-2
in. water
mbar
2.489
in. water
mtorr or micron Hg
1.868 x 10
3
in. water
Pa or N/m
2
248.9
in. water
psi or lb/in
2
3.612 x 10
-2
in. water
torr or mm Hg
1.868
kg/cm
2
atmosphere
0.9678
kg/cm
2
bar
0.9804
kg/cm
2
dynes/cm
2
9.804 x 10
5
kg/cm
2
in. Hg
28.958
kg/cm
2
in. water
393.76
kg/cm
2
mbar
9.804 x 10
2
kg/cm
2
mtorr or micron Hg
7.3554 x 10
5
kg/cm
2
Pa or N/m
2
9.804 x 10
4
kg/cm
2
psi or lb/in
2
14.223
kg/cm
2
torr or mm Hg
7.3554 x 10
2
mbar
atmosphere
9.872 x 10
-4
mbar
bar
0.001
mbar
dynes/cm
2
1000
mbar
kg/cm
2
1.0200 x 10
-3
mbar
in. Hg
2.954 x 10
-2
mbar
in. water
0.4018
mbar
mtorr or micron Hg
7.5028 x 10
2
mbar
Pa or N/m
2
100
mbar
psi or lb/in
2
1.450 x 10
-2
mbar
torr or mm Hg
0.75028
mtorr or micron Hg
atmosphere
1.316 x 10
-6
mtorr or micron Hg
bar
1.3328 x 10
-6
mtorr or micron Hg
dynes/cm
2
1.3328
mtorr or micron Hg
kg/cm
2
1.3595 x 10
-6
mtorr or micron Hg
in. Hg
3.937 x 10
-5
mtorr or micron Hg
in. water
5.353 x 10
-4
mtorr or micron Hg
mbar
1.3328 x 10
-3
mtorr or micron Hg
Pa or N/m
2
0.13328
mtorr or micron Hg
psi or lb/in
2
1.934 x 10
-5
mtorr or micron Hg
torr
1 x 10
-3
Pa or N/m
2
atmosphere
9.869 x 10
-6
Pa or N/m
2
bar
1 x 10
-5
Pa or N/m
2
dynes/cm
2
10
Pa or N/m
2
kg/cm
2
1.020 x 10
-5
Pa or N/m
2
in. Hg
2.954 x 10
-4
Pa or N/m
2
in. water
4.018 x 10
-3
Pa or N/m
2
mbar
0.01
Pa or N/m
2
mtorr or micron Hg
7.5028
Pa or N/m
2
psi or lb/in
2
1.4508 x 10
-4
Pa or N/m
2
torr or mm Hg
7.5028 x 10
-3
psi or lb/in
2
atmosphere
0.06805
psi or lb/in
2
bar
0.06893
psi or lb/in
2
dynes/cm
2
6.8927 x 10
4
psi or lb/in
2
kg/cm
2
7.0309 x 10
-2
psi or lb/in
2
in. Hg
2.036
psi or lb/in
2
in. water
27.68
psi or lb/in
2
mbar
68.97
psi or lb/in
2
mtorr or micron Hg
5.171 x 10
4
psi or lb/in
2
Pa or N/m
2
6.8927 x 10
3
psi or lb/in
2
torr or mm Hg
51.71
torr or mm Hg
atmosphere
1.3158 x 10
-3
torr or mm Hg
bar
1.3328 x 10
-3
torr or mm Hg
dynes/cm
2
1.3328 x 10
3
torr or mm Hg
kg/cm
2
1.3595 x 10
-3
torr or mm Hg
in. Hg
3.937 x 10
-2
torr or mm Hg
in. water
0.5353
torr or mm Hg
mbar
1.3328
torr or mm Hg
mtorr or micron Hg
1000
torr or mm Hg
Pa or N/m
2
133.28
torr or mm Hg
psi or lb/in
2
1.934 x 10
-2
Converting Pumping Speed
To Convert
Into
Multiply
ft
3
/min
L/sec
0.47195
ft
3
/min
m
3
/hr
1.69901
L/hr
L/sec
2.77778 x 10
-4
L/min
L/sec
1.66667 x 10
-2
L/sec
ft
3
/min
2.11887
L/sec
m
3
/sec
0.001
L/sec
m
3
/hr
3.6
m
3
/hr
ft
3
/min
0.58858
m
3
/hr
L/sec
0.27778
Converting Throughput Units
To Convert
Into
Multiply
atm.cc/sec
Pa.L/sec
101.295
atm.cc/sec
molecules/sec
2.6868 x 10
19
atm.cc/sec
torr.L/sec
0.7600
atm.cc/sec
watt
0.10143
micron.L/sec
Pa.L/sec
0.13328
molecules/sec
atm.cc/sec
3.7219 x 10
-20
molecules/sec
Pa.L/sec
3.7701 x 10
-18
molecules/sec
torr.L/sec
2.8287 x 10
-20
molecules/sec
watt
3.7701 x 10
-21
Pa.L/sec
atm.cc/sec
9.872 x 10
-3
Pa.L/sec
molecules/sec
2.652 x 10
17
Pa.L/sec
Pa.m
3
/hr
3.6
Pa.L/sec
torr.L/sec
7.5028 x 10
-3
Pa.L/sec
watt
10
-3
torr.L/sec
atm.cc/sec
1.31579
torr.L/sec
watt
0.13328
torr.L/sec
molecules/sec
3.5352 x 10
19
torr.L/sec
Pa.L/sec
133.28
watt
atm.cc/sec
9.859
watt
molecules/sec
2.5 x 10
20
watt
Pa.L/sec
1000
watt
torr.L/sec
7.503
Converting Outgassing Units
To Convert
Into
Multiply
micron.L/(cm
2
.sec)
Pa.L/(m
2
.sec)
1332.8
micron.L/(cm
2
.sec)
Pa.m
3
/(m
2
.sec)
1.3328
micron.L/(cm
2
.sec)
torr.L/(cm
2
.sec)
1 x 10
-3
micron.L/(cm
2
.sec)
W/m
2
1.3328
Pa.L/(m
2
.sec)
Pa.m
3
/(m
2
.sec)
1 x 10
-3
Pa.L/(m
2
.sec)
micron.L/(cm
2
.sec)
7.5 x 10
-4
Pa.L/(m
2
.sec)
torr.L/(cm
2
.sec)
7.5 x 10
-7
Pa.L/(m
2
.sec)
W/m
2
1 x 10
-3
Pa.m
3
/(m
2
.sec)
micron.L/(cm
2
.sec)
0.75
Pa.m
3
/(m
2
.sec)
Pa.L/(m
2
.sec)
1000
Pa.m
3
/(m
2
.sec)
torr.L/(cm
2
.sec)
7.5 x 10
-4
Pa.m
3
/(m
2
.sec)
W/m
2
1
torr.L/(cm
2
.sec)
micron.L/(cm
2
.sec)
1000
torr.L/(cm
2
.sec)
Pa.L/(m
2
.sec)
1.3332 x 10
6
torr.L/(cm
2
.sec)
Pa.m
3
/(m
2
.sec)
1333.2
torr.L/(cm
2
.sec)
W/m
2
1333.2
W/m
2
micron.L/(cm
2
.sec)
0.75
W/m
2
Pa.L/(m
2
.sec)
1000
W/m
2
Pa.m
3
/(m
2
.sec)
1
W/m
2
torr.L/(cm
2
.sec)
7.50 x 10
-4
Converting Weights and Measures
To Convert
Into
Multiply
ampere-turn
gilbert
1.257
ampere-turn/cm
ampere-turn/in
2.54
ampere-turn/in
gilbert/cm
0.495
ampere-turn/in
ampere-turn/cm
0.3937
ampere/cm
2
ampere/in
2
6.452
angstrom
microinch
0.00393
angstrom
millimicron
0.1
angstrom
cm
10
-8
angstrom
nanometer
0.1
angstrom
micron
10
-4
b/mil ft
grams/cm
3
2.306 x 10
6
Btu
joule
1054
Btu
kilowatt-hour
2.929 x 10
-4
Btu
ft-lb
777.6
Btu/minute
watt
17.57
calorie (kg)
joule
4184
calorie (kg)
Btu
3.968
calorie (kg)
horsepower hr.
1.558 x 10
-3
calorie (kg)
ft-lb
3086
calories (kg)
kilowatt-hour
1.162 x 10
-3
circular mil
cm
2
5.067 x 10
-6
circular mil
in
2
7.854 x 10
-7
circular mil
sq mil
0.7854
cm
mil
393.7
cm
inch
0.3937
cm
angstrom
10
8
cm
2
ft
2
1.076 x 10
-3
cm
2
circular mil
1.974 x 10
5
cm
2
in
2
0.155
cm
3
gallon
2.642 x 10
-4
cm
3
in
3
6.102 x 10
-2
cm
3
quarts (liquid)
1.057 x 10
-3
cm
3
liter
10
-3
cm
3
ft
3
3.531 x 10
-5
cm
3
pints (liquid)
2.113 x 10
-3
coulombs/in
2
coulombs/cm
2
0.155
degree (angle)
minute
60
degree (angle)
second
3600
degree (angle)
radian
0.01745
degree/sec
radian/sec
0.01745
degree/sec
revolution/sec
0.002778
degree/sec
rpm
0.1667
dyne
pound
2.248 x 10
-6
dyne
gram
1.020 x 10
-3
dynes/cm
2
bar
1 x 10
-6
erg
dyne-cm
1
erg
kg-meter
1.020 x 10
-8
erg
gram-cm
1.020 x 10
-3
erg
ft-lb
7.376 x 10
-8
erg
kg-calorie
2.390 x 10
-11
erg
joule
10
-7
erg
Btu
9.486 x 10
-11
ergs/sec
Btu/min
5.691 x 10
-9
ergs/sec
kilowatt
10
-10
ergs/sec
ft-lb/min
4.42 x 10
-6
feet
cm
30.48
feet
meter
0.3048
ft-lb
meter-kilogram
0.1383
ft-lb
cm-gram
13.826
ft-lb
cm-dyne
1.356 x 10
7
ft
2
in
2
144
ft
2
m
2
0.0929
ft
2
cm
2
929.0
ft
3
lb. water
62.4
ft
3
liter
28.32
ft
3
pint (liquid)
59.84
ft
3
cm
3
2.832 x 10
4
ft
3
in
3
1728
ft
3
m
3
0.02832
ft
3
quart (liquid)
29.92
ft
3
gallon
7.481
ft
3
yd
3
0.03704
ft
3
/min
gallon/sec
0.1247
ft
3
/min
cm
3
/sec
471.9
ft
3
/min
liter/sec
0.4719
gallon
quart (liquid)
4
gallon
liter
3.785
gallon
cm
3
3785
gallon
pint (liquid)
8
gallon
ft
3
0.1337
gallon
lb. water
8.34
gallon
in
3
231
gallon
m
3
3.785 x 10
-3
gallon/min
liter/sec
0.064
gallon/min
ft
3
/sec
2.228 x 10
-3
gauss
lines/in
2
6.452
gilbert
ampere-turn
0.7958
gram
oz
0.03527
gram
dyne
980.7
gram
lb
2.205 x 10
-3
gram-calorie
Btu
3.968 x 10
-3
gram-cm
kg-meter
10
-5
gram-cm
joule
9.807 x 10
-5
gram-cm
ft-lb
7.233 x 10
-5
gram-cm
erg
980.7
gram-cm
Btu
9.302 x 10
-8
gram-cm
kg-calorie
2.344 x 10
-8
gram/cm
lb/in
5.6 x 10
-3
gram/cm
3
lb/circular mil ft
3.405 x 10
-7
gram/cm
3
lb/in
3
0.03613
gram/cm
3
lb/ft
3
62.43
horsepower
horsepower
(metric)
1.014
horsepower
watt
745.7
in
2
ft
2
6.944 x 10
-3
in
2
cm
2
6.452
in
2
sq mil
10
6
in
2
mm
2
645.2
in
2
circular mil
1.273 x 10
6
in
3
pint (liquid)
0.0346322
in
3
quart (liquid)
0.01732
in
3
liter
1.639 x 10
-2
in
3
gallon
4.329 x 10
-3
in
3
m
3
1.639 x 10
-5
in
3
ft
3
5.787 x 10
-4
in
3
cm
3
16.39
inch
angstrom
2.54 x 10
8
inch
cm
2.54
joule
watt-hour
2.778 x 10
-4
joule
kg-meter
0.1020
joule
kg-calorie
2.390 x 10
-4
joule
ft-lb
0.7377
joule
erg
10
7
joule
Btu
9.486 x 10
-4
kilogram
tons (short)
1.102 x 10
-3
kilogram
lb
2.2046
kilogram (force)
dyne
980,665
kilogram-meter
kilowatt-hour
2.724 x 10
-6
kiloline
maxwell
10
3
kilometer
mile
0.6214
kilometer
feet
3281
kilowatt
ft-lb/sec
737.6
kilowatt
ft-lb/min
4.425 x 10
4
kilowatt
Btu/minute
56.92
kilowatt-hour
kilogram-meter
3.671 x 10
5
kilowatt-hour
joule
3.6 x 10
6
kilowatt-hour
ft-lb
2.655 x 10
6
kilowatt-hour
Btu
3415
km/hour
m/min
16.67
km/hour
mile/hour
0.6214
km/hour
ft/sec
0.9113
km/hour
ft/min
54.68
km/hour
cm/sec
27.78
km
2
ft
2
1.076 x 10
7
lb water
gallon
0.1198
lb water
in
3
27.68
lb water
ft
3
0.01602
lb water/min
ft
3
/sec
2.669 x 10
-4
lb/ft
kg/meter
1.488
lb/ft
2
kg/m
2
4.882
lb/ft
2
ft. water
0.01602
lb/ft
2
lb/in
2
6.944 x 10
-3
lb/in
grams/cm
178.6
lb/in.
2
lb/ft
2
144
lb/in.
2
kg/m
2
703.1
lb/in.
2
in. Hg
2.036
lb/in.
2
ft. water
2.307
lb/in.
2
atmosphere
0.06804
lines/cm
2
gauss
1
lines/in
2
gauss
0.155
liter
quart (liquid)
1.057
liter
pint (liquid)
2.113
liter
gallon
0.2642
liter
in
3
61.02
liter
ft
3
0.03531
liter/min
gallon/sec
4.403 x 10
-3
liter/min
ft
3
/sec
5.885 x 10
-4
lumen/ft
2
foot-candle
1
m/min
miles/hour
0.03728
m/min
km/hour
0.06
m/min
ft/sec
0.05468
m/sec
miles/min
0.03728
m/sec
km/min
0.06
m/sec
km/hr
3.6
m/sec
ft/sec
3.281
m/sec
ft/min
196.8
m/sec
miles/hour
2.237
m
2
sq mile
3.861 x 10
-7
m
2
ft
2
10.764
m
3
quarts (liquid)
1057
m
3
pints (liquid)
2113
m
3
gallon
264.2
m
3
in
3
61,024
m
3
ft
3
35.31
m
3
cm
3
10
6
maxwell
kiloline
10
-3
megaline
maxwell
10
6
meter
inch
39.37
meter
feet
3.2808
meter
angstrom
10
10
mhos/mil ft
megmhos/in
3
15.28
mhos/mil ft
megmhos/cm
3
6.015
microhm/cm
3
ohms/mil ft
6.015
microhm/cm
3
microhms/in
3
0.3937
microhm/in
3
microhm/cm
3
2.54
microinch
angstrom
254
micromicron
angstrom
0.01
micron
angstrom
10,000
mil
inch
10
-3
mil
cm
0.0025
milliliter
cm
3
1.0
millimeter
mil
39.37
millimeter
micron
1000
millimeter
inch
0.03937
millimeter
angstrom
10
7
millimicron
angstrom
10
minute
seconds (angle)
60
minutes (angle)
radian
2.909 x 10
-4
mm
2
in
2
1.55 x 10
-3
mm
2
cm
2
0.01
mm
2
circular mil
1.974 x 10
3
nanometer
micron
10
-3
ohms/mil ft
microhm/in
3
0.06524
ohms/mil ft
microhm/cm
3
0.1662
ounces (fluid)
liter
0.02957
ounces (fluid)
in
3
1.805
oz/in
2
psi
0.0625
pints (liquid)
in
3
28.88
pints (dry)
in
3
33.6
pound
oz
16
pound
gram
453.6
pound (force)
dyne
444,823
quadrants (angle)
radian
1.571
quadrants (angle)
minute
5400
quadrants (angle)
degree
90
quart
fluid ounce
32
quarts (liquid)
in
3
57.75
quarts (dry)
in
3
67.2
radian
degrees/sec
57.3
radian
quandrant
0.637
radian
minute
3438
radian
degree
57.3
radians/sec
revolutions/sec
0.1592
radians/sec
rpm
9.549
revolution
radian
6.283
revolution
quadrant
4
revolution
degree
360
revolutions/sec
rpm
60
revolutions/sec
radians/sec
6.283
revolutions/sec
degrees/sec
360
rpm
revolutions/sec
0.01667
rpm
radians/sec
0.1047
rpm
degrees/sec
6
seconds (angle)
radian
4.848 x 10
-6
spheres (solid angle)
steradian
12.57
spherical rt. angle
steradian
1.571
spherical rt. angle
sphere
0.125
spherical rt. angle
hemisphere
0.25
steradian
sphere
0.07958
steradian
hemisphere
0.1592
stere
liter
10
3
tons (short)
lb
2000
tons (short)
kg
907.2
tons (metric)
lb
2205
tons (metric)
kg
10
3
tons (long)
lb
2240
tons (long)
kg
1016
watt
kilowatt
10
-3
watt
ft-lb/sec
0.7376
watt
ft-lb/min
44.25
watt
ergs/sec
10
7
watt
Btu/min
0.05692
watt-hour
kilogram-meter
367.1
watt-hour
ft-lb
2655
watt-hour
Btu
3.414
weber
maxwell
10
8
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