DOC.
33
191
Doc. 33
"SUPPLEMENT"
TO
"A
NEW DETERMINATION OF MOLECULAR
DIMENSIONS"
[Appended
to
the version
of
Document
15
that
was
published
as
an
article in
Annalen
der
Physik
19
(1906):
289-305]
[Annalen
der
Physik
19
(1906):
305-306]
The
new
edition of Landolt
and
Börnstein's
Physical-Chemical
Tables [1]
contains data
that
are
much
more
useful for
calculating
the size
of the
sugar
molecule
and
the
number
N
of
real molecules in
a
gram-molecule.
Thovert
found
(Tables,
p.
372)
that the coefficient
of
diffusion
of [2]
sugar
in
water at
18.5°C
at
a
concentration
of 0.005
mol/liter
has
the value
of 0.33
cm2/day.
Further,
from
a
table
containing
observed values obtained
by
Hosking
(Tables,
p. 81)
we
can
find
by
interpolation
that
in
a
dilute
sugar
[3]
solution
a
1%
increase
in
sugar
content at 18.5°C
corresponds to
a
0.00025
increase in the coefficient of
viscosity.
[4]
Based
on
these data,
one
finds
P
=
0.78*
10"6
mm
and
N
=
4.15*1023.
Bern, January 1906.