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Pressure and Stress Units Conversion
Pressure (symbol: p) is the force per unit area acting on a surface in a direction perpendicular to that surface.
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Because pressure is commonly measured by its ability to displace a column of liquid in a manometer, pressures are often expressed as a depth of a particular fluid (e.g. inches of water). The most common choices are mercury (Hg) and water; water is nontoxic and readily available, while mercury's density allows for a shorter column (and so a smaller manometer) to measure a given pressure.
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The bar (symbol bar) and the millibar (symbol mbar, also mb) are units of pressure. They are not SI units, but accepted (although discouraged) for use with the SI. The bar is still widely used in descriptions of pressure because it is about the same as atmospheric pressure.
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Convert from Water (at 39.2°F, 4°C) inch of water
bar (bar)
hectopascal (hPa)
kilogram per square centimeter (kgf/cm²)
kilogram per square meter (kgf/m²)
kilogram per square millimeter (kgf/mm²)
kilonewton per square meter (kN/m²)
kilopascal (kPa)
meganewton per square meter (MN/m²)
megapascal (MPa)
millibar (mbar)
newton per square meter (N/m²)
newton per square millimeter (N/mm²)
pascal (Pa)
newton per square centimeter (N/cm²)
thousand pounds per square inch (ksi)
ton per square foot (long)
ton per square foot (short)
ton per square inch (long)
ton per square inch (short)
pound per square foot (psf)
pound per square inch (psi)
centimeter of water (cmH2O)
inch of water (inH2O)
millimeter of water (mmH2O)
micrometer of water
foot of water
meter of water (mH2O)
technical atmosphere (at)
physical atmosphere (atm)
centimeter of mercury (cmHg)
inch of mercury (inHg)
micron of mercury
foot of mercury
micrometer of mercury
millimeter of mercury (mmHg)
torr (torr)
meter of air (0 °C)
meter of air
inch of air (0 °C)
inch of air (15 °C)
foot of air (0 °C)
foot of air (15 °C)
barad (Ba)
barye (Ba)
centibar
centihg
foot of head
attobar
attopascal
centipascal
centitorr
decibar (dbar)
decipascal
decitorr
dekabar
dekapascal
dyne per square centimeter
exabar
exapascal
femtobar
femtopascal
kilobar
gigabar
gigapascal
gram per square centimeter
hectobar
kilopond per square centimeter
kilopond per square meter
kilopond per square millimeter
kip per square foot
kip per square inch
megabar
meter of head
microbar
micropascal
millipascal
millitorr
nanobar
nanopascal
ounce per square inch
millihg
yoctobar
yoctopascal
yottabar
yottapascal
zeptobar
zeptopascal
zettabar
zettapascal
poundal per square foot
sthene per square meter
petabar
petapascal
picobar
picopascal
pieze (pz)
terabar
terapascal
ton per square meter
Value
...calculating...
Format result
0 decimals
1 decimals
2 decimals
3 decimals
4 decimals
5 decimals
6 decimals
7 decimals
1 inch of water is equal to:
Metric
bar
0.0025
hectopascal
2.4909
kilogram per square centimeter
0.0025
kilogram per square meter
25.4
kilogram per square millimeter
2.54 x 10
-05
kilonewton per square meter
0.2491
kilopascal
0.2491
meganewton per square meter
0.0002
megapascal
0.0002
millibar
2.4909
newton per square meter
249.0889
newton per square millimeter
0.0002
pascal
249.0889
newton per square centimeter
0.0249
British and U.S.
thousand pounds per square inch
3.6127 x 10
-05
ton per square foot (long)
0.0023
ton per square foot (short)
0.0026
ton per square inch (long)
1.6128 x 10
-05
ton per square inch (short)
1.8064 x 10
-05
pound per square foot
5.2023
pound per square inch
0.0361
Water (at 39.2°F, 4°C)
centimeter of water
2.54
inch of water
1
millimeter of water
25.4
micrometer of water
25399.9998
foot of water
0.0833
meter of water
0.0254
Atmosphere
technical atmosphere
0.0025
physical atmosphere
0.0025
Mercury
centimeter of mercury
0.1868
inch of mercury
0.0736
micron of mercury
1868.3202
foot of mercury
0.0061
micrometer of mercury
1868.3202
millimeter of mercury
1.8683
torr
1.8683
Air
meter of air (0 °C)
19.6482
meter of air
20.7308
inch of air (0 °C)
773.5503
inch of air (15 °C)
816.1736
foot of air (0 °C)
64.4625
foot of air (15 °C)
68.0145
French
barad
2490.8891
barye
2490.8891
Other
centibar
0.2491
centihg
0.1868
foot of head
0.0833
attobar
2.4909 x 10
15
attopascal
2.4909 x 10
20
centipascal
24908.8908
centitorr
186.832
decibar
0.0249
decipascal
2490.8891
decitorr
18.6832
dekabar
0.0002
dekapascal
24.9089
dyne per square centimeter
2490.8891
exabar
2.4909 x 10
-21
exapascal
2.4909 x 10
-16
femtobar
2490889083333.33
femtopascal
2.4909 x 10
17
kilobar
2.4909 x 10
-06
gigabar
2.4909 x 10
-12
gigapascal
2.4909 x 10
-07
gram per square centimeter
2.54
hectobar
2.4909 x 10
-05
kilopond per square centimeter
0.0025
kilopond per square meter
25.4
kilopond per square millimeter
2.54 x 10
-05
kip per square foot
0.0052
kip per square inch
3.6127 x 10
-05
megabar
2.4909 x 10
-09
meter of head
0.0254
microbar
2490.8891
micropascal
249088908.3333
millipascal
249088.9083
millitorr
1868.3204
nanobar
2490889.0833
nanopascal
249088908333.333
ounce per square inch
0.578
millihg
1.8683
yoctobar
2.4909 x 10
21
yoctopascal
2.4909 x 10
26
yottabar
2.4909 x 10
-27
yottapascal
2.4909 x 10
-22
zeptobar
2.4909 x 10
18
zeptopascal
2.4909 x 10
23
zettabar
2.4909 x 10
-24
zettapascal
2.4909 x 10
-19
poundal per square foot
167.38
sthene per square meter
0.2491
petabar
2.4909 x 10
-18
petapascal
2.4909 x 10
-13
picobar
2490889083.3333
picopascal
249088908333333
pieze
0.2491
terabar
2.4909 x 10
-15
terapascal
2.4909 x 10
-10
ton per square meter
0.0254
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