Diffusion is a truly interdisciplinary topic bridging all areas of STEM education. When biomolecules are not being moved through the body by fluid flow through the circulatory system or by molecular motors, diffusion is the primary mode of transport over short distances. The direction of the diffusive flow of particles is from high concentration toward low concentration.
References
1.
J.
Jadrich
and C.
Bruxvoort
, “Investigating diffusion and entropy with carbon dioxide-filled balloons
,” Phys. Teach.
48
, 388
(Sept.
2010
).2.
K.
Pearson
, “The problem of the random walk
,” Nature
72
, 294
(1905
).3.
A.
Einstein
, “On the movement of small particles suspended in a stationary liquid demanded by the molecular theory of heat
,” Ann. Phys.
17
, 549
(1905
).4.
F.
Reif
, Fundamentals of Statistical and Thermal Physics
(McGraw-Hill
, New York
, 1965
), pp. 486
–488
.5.
P.
Nelson
, Biological Physics: Energy, Information, Life
, updated 1st ed. (W. H. Freeman and Company
, New York
, 2008
), Chap. 4.6.
T. M.
Nordlund
, Quantitative Understanding of Biosystems: An Introduction to Biophysics
(CRC Press
, Boca Raton, FL
, 2011
), Chap. 13.7.
J.
Newman
, Physics of the Life Sciences
(Springer
, New York
, 2008
), pp. 33
–35
.8.
J. B.
Reece
, L. A.
Urry
, M. L.
Cain
, S. A.
Wasserman
, P. V.
Minorsky
, and R. B.
Jackson
, Campbell Biology
, 10th ed. (Pearson
, San Francisco
, 2014
), p. 135
.9.
B. W.
Dreyfus
, B. D.
Geller
, D. E.
Meltzer
, and V.
Sawtelle
, “Resource Letter TTSM-1: Teaching thermodynamics and statistical mechanics in introductory physics, chemistry, and biology
,” Am. J. Phys.
83
, 5
(Jan. 2015
).10.
B.
Brazzle
, “A random walk to stochastic diffusion through spreadsheet analysis
,” Am. J. Phys.
81
, 823
(Nov.
2013
).© 2017 American Association of Physics Teachers.
2017
American Association of Physics Teachers
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