Environmental Engineering Reference
In-Depth Information
Ta b l e A . 6
Conversion factors in formulas used in gas and plasma physics.
Number
Formula
C
Units
10
21
cm
3
1
N
D
Cp
/
T
7.339
p
in atm,
T
in K
10
18
cm
3
9.657
p
in Torr,
T
in K
10
19
To r r
N
in cm
3
,
T
in K
2
p
D
CNT
1.036
CN
e
/
T
3
10
21
N
e
in cm
3
,
T
in eV
3
γ
D
2.998
10
9
N
e
in cm
3
,
T
in K
4.685
Cm
3/2
T
3/2
10
15
cm
3
4
D
2.415
T
,
m
in emu
10
21
cm
3
T
in eV,
m
in emu
3.019
10
20
cm
3
T
in K,
m
in amu
1.879
10
26
cm
3
T
in eV,
m
in amu
2.375
C
/
T
9/2
e
10
31
cm
6
/s
5
K
D
2.406
T
e
in 1000 K
C
p
N
e
/
m
10
4
s
1
N
e
in cm
3
,
m
in emu
ω
p
D
6
5.642
1322 s
1
N
e
in cm
3
,
m
in amu
C
p
T
/
N
e
N
e
in cm
3
,
T
in eV
r
D
D
7
525.3 cm
N
e
in cm
3
,
T
in K
4.876 cm
CU
3/2
m
1/2
l
2
10
8
A/cm
2
8
i
D
5.447
m
in amu,
l
in cm,
U
in V
10
6
A
2
2.326
m
in emu,
l
in cm,
U
in V
Cm
1/3
l
4/3
i
2/3
m
in amu,
l
in cm,
i
in A/cm
2
9
U
D
69 594
m
in emu,
l
in cm,
i
in A/cm
2
5697 V
Cm
1/4
U
3/4
i
1/2
10
4
cm
m
in amu,
U
in V,
i
in A/cm
2
10
l
D
2.3338
10
3
cm
m
in emu,
U
in V,
i
in A/cm
2
1.525
1 The gas state equation (4.12).
2 The gas state equation (4.12).
3 The ideality plasma parameter (1.3),
N
e
e
6
/
T
e
.
γ
D
4 Preexponent of the Saha formula (1.52)
2
)]
3/2
.
5 The rate constant of three body electro
n-ion recom
bination (2.71),
K
D
[
mT
/(2
π
„
1.5
e
10
/(
m
1/
e
T
9/2
e
D
).
p
4
6 The plasma frequency (1.13),
ω
D
π
N
e
e
2
/
m
e
.
p
p
T
/(8
7 The Debye-Hückel radius (1.7),
r
D
D
π
N
e
e
2
).
)
p
e
/(2
m
)
U
3/2
/
l
2
,where
l
is the distance between
electrodes,
U
isthedifferenceinelectrodevoltages,
i
is the maximum current density, and
e
and
m
are the particle charge and mass.
9 The three-halves law in the form
U
8 The three-halves law (1.31),
i
D
2/(9
π
i
/2)
2/3
(2
m
/
e
)
1/3
l
4/3
.
D
(9
π
10 The three-halves law in the form
l
D
(2/(9
π
))
1/2
(
e
/(2
m
))
1/4
U
3/4
/
i
1/2
.
