Conversion of pressure units air pressure - 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 ≡ 1  kg · m−1 · s−2 (N = newton)
FAQ: 1 megapascal = 1,000,000 pascals

air pressure meter

Enter on the left side the unit and the known number. On the
right side you will get the calculated result with the adjusted unit.

       is:

To the Super Calculator for pressure units

Standard atmospheric (air) pressure is 101325 pascals = 1013.25 hPa = 101.325 kPa
Important to know: 1 Pa = 1 N/m294 dBSPL and 1 bar = 105 Pa.
1000 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
1pascal (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 = 101325 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.
kilopascal
(kPa)
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.
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 6.89472×104
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 in 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:

formula
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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