DOC.
4
KINETIC THEORY LECTURE NOTES
155
One obtains
V
s
=
A-
N
=
V2
The determination of N
very
unreliable because of the
powers
of
A
(path length)
One
obtains
values
between
1023
&
1024;
s
~
10-7 mm.[23]
Direct
Influence
of Path
Length
on
the
Phenomena
We had
considered
the
flow
of the molecular function
G in
a
stationary
state. Must be
equal
to
this flow when
infinitely
close to
the
wall.
For the
molecules
flying
off of
the wall
the
value
of
the
quantity
G
is
on
the
average
G0.
For those
going upwards
from below
the
value is
dG
+Acosp)
^0
When the molecule
returns,
it has
G0.
Hence
the
molecule
transports
[p.
9]
BG0
G0~
G'
+
-
-
Xcos
p
ö
0
dz
dK
There
are
n
-
such
(dk)
molecules in
a
unit
volume.
4«
hence
n-c
d"K
dt
cosp
act in
the time
element
dt
4n
Hence total
flow
through
surface