DOC.
43
235
Doc.
43
Author's abstract of lecture
"ON
THE
NATURE OF THE MOVEMENTS OF
MICROSCOPICALLY
SMALL
PARTICLES
SUSPENDED
IN
LIQUIDS"
[Naturforschende
Gesellschaft Bern.
Mitteilungen
(1907)]
1038.
SESSION
OF
23
MARCH
1907
At 8 P.M.
in
the Hotel Storchen
[1]
Chairman:
Mr. Ed.
Fischer. Present:
20 members
and guests. [2]
1.
Mr.
A.
Einstein
speaks
"On
the
nature
of the
movements
of
microscopically
small particles
suspended
in liquids."
Microscopically
small inanimate
particles
(e.g., with diameters of the
order of
magnitude
0.001
mm)
suspended
in
liquids
carry
out
irregular
motions [3]
that
are more
animated the smaller the diameter
of the
particle
and
the
viscosity
of the
liquid
and
the
higher
the
temperature
(Brownian
motion).
After
a
brief
discussion
of
the different
attempts
at explanation,
a
simple [4]
formula for the distances covered
by
the
particles
is derived
by
the
lecturer
[5]
in
an
elementary
way
with the aid of the kinetic
theory
of heat.
(Author's
abstract)
[6]
For
more
on
the topic,
see:
Ann.
d.
Physik 17 (1905):
549.
[7]
Ann.
d.
Physik 19 (1906):
371.