We present a simple model of the dynamics of the drinking bird and relate its period to the properties of its internal and external liquids. The effect of humidity on the motion is studied and it is shown that there are two evaporation regimes. The results of the model are in agreement with observations.

1.
M. V. Sullivan, U. S. Patent 2,402,463 (1946);
K. B.
Kolb
, “
Drinking duck shutter
,”
Phys. Teach.
5
,
342
(
1967
);
L. M.
Ng
and
Y. S.
Ng
, “
The Thermodynamics of the Drinking Bird Toy
,”
Phys. Educ.
28
,
320
324
(
1993
);
H. E.
Stockman
, “
Dunking duck without liquid
,”
Am. J. Phys.
29
,
335
336
(
1961
);
H. E.
Stockman
, “
Secret of the dunking duck
,”
Am. J. Phys.
29
,
374
375
(
1961
);
E.
Guarner
and
A. M.
Sánchez
, “
The superconducting bird: A didactical toy
,”
Phys. Teach.
30
,
176
177
(
1992
);
C. F. Bohren, Clouds in a Glass of Beer (Wiley, New York, 1987).
2.
J. S.
Miller
, “
Physics of the dunking duck
,”
Am. J. Phys.
26
,
42
43
(
1958
);
J. L.
Gaines
, “
Dunking duck
,”
Am. J. Phys.
27
,
189
190
(
1959
);
D. L.
Frank
, “
The drinking bird and the scientific method
,”
J. Chem. Educ.
50
,
211
(
1973
).
3.
R.
Plumb
, “
Physical chemistry of the drinking duck
,”
J. Chem. Educ.
50
,
213
(
1973
);
K. B.
Kolb
, “
Reciprocating engine
,”
Phys. Teach.
4
,
121
122
(
1966
).
4.
R.
Mentzer
, “
The drinking bird. The little heat engine that could
,”
Phys. Teach.
31
,
126
127
(
1993
).
5.
Drinking Bird Arora ©1997. Patent 100616. Tobar Ltd., Norfolk, UK.
6.
J.
Güémez
,
R.
Valiente
,
C.
Fiolhais
, and
M.
Fiolhais
, “
Experiments with a sunbird
,”
Am. J. Phys.
71
,
1264
1267
(
2003
), following paper.
7.
D. A. McQuarrie and J. D. Simon, Molecular Thermodynamics (University Science Books, Sausalito, CA, 1999);
D. V. Schroeder, Introduction to Thermal Physics (Addison–Wesley, Reading, 1999);
M. W. Zemansky and R. H. Dittman, Heat and Thermodynamics (McGraw–Hill, Singapore, 1997), 7th ed.
8.
The time interval between consecutive dips which is experimentally measured should be corrected for the time elapsed while the bird is at rest in the horizontal position (approximately 1 s) in order to be compared with Eq. (6).
9.
K. Raznjevic, Tables et Diagrammes Thermodynamiques (Editions Eyrolles, Paris, 1970).
10.
A. J.
Abraham
and
C. P.
Bean
, “
A simple method for measurement of the diffusion of vapors
,”
Am. J. Phys.
57
,
325
329
(
1989
).
11.
J. I.
Zubizarreta
and
G.
Pinto
, “
An ancient method for cooling water explained by mass and heat transfer
,”
Chem. Eng. Educ.
29
,
96
99
(
1995
).
12.
For water at room temperature, the value PE(TR)=3.26×103Pa is found from the Clausius–Clapeyron equation, inserting TE,b=373.15 K and ΔhE (given in Table II) in Eq. (7) instead of TI,b and ΔhI, respectively.
13.
H. Gould and J. Tobochnik, An Introduction to Computer Simulation Methods (Addison–Wesley, Reading, 1996), 2nd ed.
14.
C.
Bachhuber
, “
Energy from the evaporation of water
,”
Am. J. Phys.
51
,
259
264
(
1983
).
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