Magnitude (pressure)

This is a compilation of pressures of various orders of magnitude for comparison purposes. The information is often to be understood as "typical values".

The unit of pressure in the international system of units is the pascal ( unit symbol Pa). The pressure is also given in the much larger unit bar (unit symbol bar): 1 bar = 100,000 Pa.

Pressure below 1 Pa

1 Pa = 10 ⁻⁵ bar

<10 ⁻¹⁴ Pa - pressure in interplanetary space
<10 ⁻⁵ Pa - ultra high vacuum
2e^-5 Pa = 20 μPa - reference value for thesound pressure level(near thehearing threshold)
0.1–1 Pa - working pressure for freeze drying

1 Pa to 1 kPa

1 kilopascal (1 kPa) equals a thousand pascals (10 ³ Pa = 10 ⁻² bar)

10–15 Pa - pressure difference (draft) at the base of the chimney with oil boilers
611.657 Pa - equilibrium vapor pressure of pure water at the triple point of water.

1 kPa to 1 MPa

1 megapascal (1 MPa) equals one million Pascal (10 ⁶ Pa = 10 bar)

2.34 kPa - saturation vapor pressure of water at 20 ° C
9.81 kPa = 1 mWS - hydrostatic pressure at a water depth of one meter
13.3-17.4 kPa = 100-130 mmHg - systolic arterial blood pressure of a healthy person under normal conditions
32.5 kPa = 325 mbar - air pressure on the summit of Mount Everest
101.325 kPa = 1013.25 mbar = 1 atm - standard condition in physics
200–400 kPa - overpressure in mountain bike tires
500–1400 kPa - excess pressure in racing bike tires

1 MPa to 1 GPa

1 gigapascal (1 GPa) equals one billion pascals (10 ⁹ Pa = 10 ⁴ bar)

8–20 MPa - ignition pressure in the diesel engine
20–30 MPa - maximum pressure in compressed air cylinders of breathing apparatus
30 MPa - pressure in the Haber-Bosch process
80 MPa - pressure in high-pressure tanks for hydrogen in motor vehicles
107 MPa - pressure at the deepest point of the Mariana Trench

Pressure over 1 GPa

1 terapascal (1 TPa) equals one trillion pascals (10 ¹² Pa = 10 ⁷ bar)

6 GPa - pressure in the synthesis of artificial diamonds by the HTHP process
330 GPa - pressure in the earth's core at the boundary between the inner solid and liquid core
24 770 TPa - pressure in the core of the sun

Vacuum technology

There is a separate classification in vacuum technology . A distinction is made here:

Low vacuum (GV) 30,000-100 Pa
Fine vacuum (FV) 100-0.1 Pa
High vacuum (HV) 0.1–10 ⁻⁵ Pa
Ultra high vacuum (UHV) 10 ⁻⁵ −10 ⁻¹⁰ Pa
Extremely high vacuum (XHV) <10 ⁻¹⁰ Pa

Sources and individual references

↑ ^a ^b Pressure - Definition Introduction to vacuum technology on the Pfeiffer Vacuum homepage, accessed on November 26, 2019
↑ Oil heating guide , accessed on December 1, 2019.
↑ International Association for the Properties of Water and Steam (IAPWS): Guideline on the Use of Fundamental Physical Constants and Basic Constants of Water. IAPWS G5-01 (2016) ( PDF, 40 KB )
↑ Klaus Mollenhauer (Ed.): Manual Diesel Engines . Springer, 1997, p. 247
↑ HPHT-Diamant Download of the industry magazine for watches Juwelen Schmuck 10/17 page 32, accessed on December 1, 2019
↑ S. Anzellini et al .: Melting of Iron at Earth's Inner Core Boundary Based on Fast X-ray Diffraction. Science 340, 2013, pp. 464-466, doi: 10.1126 / science.1233514 .
↑ Dr. David R. Williams (NASA): Sun Fact Sheet

[Pfeiffer-1] Pressure - Definition Introduction to vacuum technology on the Pfeiffer Vacuum homepage, accessed on November 26, 2019

[2] Oil heating guide , accessed on December 1, 2019.

[IAPWS-3] International Association for the Properties of Water and Steam (IAPWS): Guideline on the Use of Fundamental Physical Constants and Basic Constants of Water. IAPWS G5-01 (2016) ( PDF, 40 KB )

[4] Klaus Mollenhauer (Ed.): Manual Diesel Engines . Springer, 1997, p. 247

[5] HPHT-Diamant Download of the industry magazine for watches Juwelen Schmuck 10/17 page 32, accessed on December 1, 2019

[6] S. Anzellini et al .: Melting of Iron at Earth's Inner Core Boundary Based on Fast X-ray Diffraction. Science 340, 2013, pp. 464-466, doi: 10.1126 / science.1233514 .

[7] Dr. David R. Williams (NASA): Sun Fact Sheet