Conversion of pressure units - sengpielaudio
 
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● Calculations and conversions of pressure units ●
 
Definition: Pressure or stress = force per area, p = F / A
F = force, A = area, p = pressure in Pa = N / m2 ≡ kg / (m · s2)
 
1 pascal = Pa ≡ 1 N · m−2 ≡ 1  J · m−3 ≡ kg · m−1 · s−2 (N = newton)
FAQ: 1 megapascal = 1,000,000 pascals

air pressure meter - sengpielaudio

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To the Super Calculator for pressure units

Standard atmospheric pressure is 101,325 pascals = 1,013.25 hPa = 101.325 kPa
Important to know: 1 Pa = 1 N/m2 ≡ 94 dBSPL and 1 bar = 105 Pa.
1,000 pascal (Pa) = 1 kilopascal (kPa).

Conversion of sound units: pascals to dBSPL

More conversions of pressure or stress units

Unit Conversions and Comments
pascal (Pa)
(Pa = N / m2)
N = Newton

1 pascal (p = F / A) = the force F of 1 newton per square meter area (1 newton = the force, which is used to accelerate 1 kilogram to 1 meter per second squared) 1 Pa ≡ 1 kg/(m · s2). Force 1 N = 1 kg × m/s2.       p = pressure; F = force; A = area
1 pascal = 10 dyne/cm2 = 0.01 mbar. 1 atm = 101,325 pascal = 760 mm Hg = 760 torr = 14.696 psi. 1 Pa = 1 N / m² = 10−5 bar = 7.5×10-3 Torr = 0.987 atm = 1 Pa = 10 µbar..

hektopascal
(hPa)		 The prefix "kilo" means "1000", therefore is 1 kilopascal = 1000 Pa and 101.325 kPa = 1 atm = 760 torr and 100 kPa = 1 bar = 750 torr.
kilopascal
(kPa)		 The prefix "mega" means "1000000", therefore is 1 megapascal = 1000 kPa = 1000000 Pa. These high pressures are very rare.
megapascal
(MPa)		 The prefix "mega" means "1000000", therefore is 1 megapascal = 1000 kPa = 1000000 Pa. These high pressures are very rare.
gigapascal
(GPa)		 The prefix "giga" means "1000000000", therefore is 1 gigapascal = 1000 MPa = 1000000 kPa = 1000000000 Pa = 9870 atm = 10000 bar. Pressures of some gigapascal can convert graphite to diamonds or can form from hydogenium a mtallic conductor.
Pounds per
square inch
(psi, PSI, lb/in2, lb/sq in)		 This unit is only used in the USA. Normal atmospheric pressure is 1 atm = 14.696 psi - that means, an air colum above us of an area of 1 square inch weighs 14.696 pounds. 1 lb/in2 = 6894.8 Pa =0.06895 bar 0,06804 atm = 51.715 Torr.
atmosphere
(atm)		 The normal air pressure is called "1 atmosphere".
1 atm = 14.6956 psi = 760 torr = 101325 Pa = 1.01325 bar.
torr
(torr)		 Torricelli barometer design: One atmosphere pressure brings a colums of mercury in a Hg barometer to a height of 760 millimeter. The pressure, which brings a collum of mercury to 1 millimeter is called 1 Torr (1 mm Hg = 1 Torr).
1 atm = 760 Torr = 14.696 psi. 1 Torr = 1/760 atm.
bar
(bar)		 The bar is nearly idendic to the atmosphere unit. 1 bar = 750.062 torr = 0.9869 atm = 100000 Pa. Normal air pressure = 1.01325 bar = 1013.25 mbar.
millibar
(mb or mbar)		 1000 millibars are 1 bar. Meteorologists like this.
1 millibar = 0.001 bar = 0.750 Torr. 1 mbar = 100 Pa = 1 hectopascal.
microbar
(µb or µbar)

1 microbar is 10−6 bar = 1 dyne/cm². 1µbar = 0.1 Pa.

Pressure conversions

from to multiply by
atmosphere bar 1.01325
atmosphere dyne/cm2 = µbar 1.01325×106
atmosphere inch Hg 29.9213
atmosphere inch H2O 406.86
atmosphere kg/cm2 1.03325
atmosphere mbar 1013.25
atmosphere mtorr = micron Hg 7.6×105
atmosphere Pa = N/m2 1.01325×105
atmosphere PSI = lb/in2 14.696
atmosphere torr = mm Hg 760
bar atmosphere 0.98692
bar dyn/cm2 = µbar 1×106
bar inch Hg 29.54
bar inch H2O 401.65
bar kg/cm2 1.02
bar mbar 1000
bar mtorr = micron Hg 7.5028×105
bar Pa = N/m2 1×105
bar psi = lb/in2 14.503861
bar torr = mm Hg 750.2838
dyne/cm2 = µbar atmosphere 9.8692×10−7
dyne/cm2 = µbar bar 1×10-6
dyne/cm2 = µbar inch Hg 2.954×10−5
dyne/cm2 = µbar inch H2O 4.0165×10−4
dyne/cm2 = µbar kg/cm2 1.0200×10−6
dyne/cm2 = µbar mbar 1×10-3
dyne/cm2 = µbar mtorr = micron Hg 0.75028
dyne/cm2 = µbar Pa = N/m2 0.1
dyne/cm2 = µbar psi = lb/in2 1.4508×10−5
dyne/cm2 = µbar torr = mm Hg 7.5028×10−4
inch Hg atmosphere 3.342×10−2
inch Hg bar 3.385×10−2
inch Hg dyne/cm2 = µbar 3.385×104
inch Hg inch H2O 1.598
inch Hg kg/cm2 3.4532×10−2
inch Hg mbar 33.85
inch Hg mtorr = micron Hg 2.54×104
inch Hg Pa = N/m2 3385
inch Hg psi = lb/in2 0.4912
inch Hg torr = mm Hg 25.4
inch H2O atmosphere 2.458×10−3
inch H2O bar 2.489×10−3
inch H2O dyn/cm2 = µbar 2.489×103
inch H2O kg/cm2 2.5396×10−3
inch H2O inch Hg 7.354×10−2
inch H2O mbar 2.489
inch H2O mtorr = micron Hg 1.868×10−3
inch H2O Pa = N/m2 248,9
inch H2O psi = lb/in2 3.612×10−2
inch H2O torr = mm Hg 1.868
kg/cm2 atmosphere 0.9678
kg/cm2 bar 0.9804
kg/cm2 dyn/cm2 = µbar 9.804×105
kg/cm2 inch Hg 28.958
kg/cm2 inch H2O 393.76
kg/cm2 mbar 9.804×102
kg/cm2 mtorr = micron Hg 7.3554×105
kg/cm2 Pa = N/m2 9.804×104
kg/cm2 psi = lb/in2 14.223
kg/cm2 torr = mm Hg 7.355×102
mbar atmosphere 9.8692×10−4
mbar bar 0.001
mbar dyen/cm2 = µbar 1000
mbar kg/cm2 1.0200×10−3
mbar inch Hg 2.954×10−2
mbar inch H2O 0.4018
mbar mtorr = micron Hg 7.5028×102
mbar Pa = N/m2 100
mbar psi = lb/in2 1.450×10−2
mbar torr = mm Hg 0.75028
mtorr = micron Hg atmosphere 1.316×10−6
mtorr = micron Hg bar 1.3328×10−6
mtorr = micron Hg dyne/cm2 = µbar 1.3328
mtorr = micron Hg kg/cm2 1.3595×10−6
mtorr = micron Hg inch Hg 3.937×10−5
mtorr = micron Hg inch H2O 5.353×10-4
mtorr = micron Hg mbar 1.3328×10−3
mtorr = micron Hg Pa = N/m2 0.13328
mtorr = micron Hg psi = lb/in2 1.934×10−5
mtorr = micron Hg torr = mm Hg 1×10-3
Pa = N/m2 atmosphere 9.8692×10−6
Pa = N/m2 bar 1×10−5
Pa = N/m2 dyne/cm2 = µbar 10
Pa = N/m2 kg/cm2 1.020×10−5
Pa = N/m2 inch Hg 2.954×10−4
Pa = N/m2 inch H2O 4.018×10−3
Pa = N/m2 mbar 0.01
Pa = N/m2 mtorr = micron Hg 7.5028
Pa = N/m2 psi = lb/in2 1.4508×10−4
Pa = N/m2 torr = mm Hg 7.5028×10−3
psi = lb/in2 atmosphere 0.06805
psi = lb/in2 bar 0.0689472
psi = lb/in2 dyne/cm2 = µbar 6.89476×104
psi = lb/in2 kg/cm2 7.0309×10−2
psi = lb/in2 inch Hg 2.036
psi = lb/in2 inch H2O 27.68
psi = lb/in2 mbar 68.9472
psi = lb/in2 mtorr = micron Hg 5.171×104
psi = lb/in2 Pa = N/m2 6.89476×103
psi = lb/in2 torr = mm Hg 51.71
torr = mm Hg atmosphere 1.3158×10−3
torr = mm Hg bar 1.3328×10−3
torr = mm Hg dyn/cm2 = µbar 1.3328×10−3
torr = mm Hg kg/cm2 1.3595×10−3
torr = mm Hg inch Hg 3.937×10−2
torr = mm Hg inch H2O 0.5353
torr = mm Hg mbar 1.3328
torr = mm Hg mtorr = micron Hg 1000
torr = mm Hg Pa = N/m2 133.28
torr = mm Hg psi = lb/in2 1.934×10−2

Pressure conversion chart

  Pa bar N/mm2 kp/m2 kp/cm2(at) atm Torr
1 Pa (N/m2) = 1 10−5 10−6 0.102 0.102×10−4 0.987×10−5 0.0075
1 bar
(daN/cm3) =		 100000 1 0.1 10200 1.02 0.987 750
1 N/mm2 = 106 10 1 1.02×105 10.2 9.87 7500
1 mkp/m2 = 9.81 9.81×10−5 9.81×10−6 1 10-4 0.968×10−4 0.0736
1 kp/m2
(1 at) =		 98100 0.981 0.0981 10000 1 0.968 736
1 atm
(760 Torr) =		 101325 1.013 0.1013 10330 1.033 1 760
1 Torr = 133 0.00133 1.33×10−4 13.6 0.00132 0.00132 1

Change of air pressure associated with the change in height

Question: How does the air pressure change if the height changes 1 meter?
 
The hydrostatic pressure is calculated according to Blaise Pascal:

This law is also assumed as an air column.
Height h = 1 m
Standard gravitational acceleration is g = 9.80665 m/s2
Density of air at 20°C is ρ20 = 1.204 kg/m3
 
1 m height changes the air pressure at a constant temperature of 20°C by
p = ρ20 ∙ g ∙ h = 1.204 kg/m3 × 9.80665 m/s2 × 1 m = 11.8 Pa (N/m²)
But the temperature decreases with height!

Conversion of sound units (levels)
Acoustic equivalent for ohm's law

  1 Pa =   1 N/m2
  10 µbar 
  10 dynes/cm2
          
1 µbar =   0.1 N/m2
  0.1 Pa 
  1 dynes/cm2
 
 
 
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