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  • Introduction to the Gas Laws
    • What is Pressure?
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    • Composition of Air
    • What is Partial Pressure?
    • Dalton's Law
    • What is Gas?
    • What is Vapour Pressure?
    • What is mean free path?
    • The mean free path for some gases at 20° C and different pressures.
    • Avogadro's Law
    • What is a Mole?
    • What is a leak rate?
    • Avogadro´s Number
    • The relative masses of molecules
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    • The Universal Gas Law
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    • Individual gas constants for some gases (J/kg x K)
    • The Greek Alphabet
  • The Flow of Gases in Leaks
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The mean free path for some gases at 20° C and different pressures

  • Print
Pressure (in Pa)
Pressure
(in mbar)
mean free path
Air
Argon
CO2
Hydrogen
Water vapour
Helium
Nitrogen
Neon
Oxygen
10-6
10-8

km
6,8
7,2
4,5
12,5
4,2
19,6
6,7
14,0
7,2
10-3
10-5

m
6,8
7,2
4,5
12,5
4,2
19,6
6,7
14,0
7,2
1
10-2

mm
6,8
7,2
4,5
12,5
4,2
19,6
6,7
14,0
7,2
103
10

μm
6,8
7,2
4,5
12,5
4,2
19,6
6,7
14,0
7,2
105
1000

nm
68
72
45
125
42
196
67
140
72

Table 5
1 nm [Nanometer] = 10-9 m

 
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