I report an innovation that provides a compelling demonstration of rocket propulsion, appropriate for students of physics and other physical sciences. An electrical spark is initiated from a distance to cause the deflagration of a combustible vapor mixed with air in a lightweight plastic bottle that is consequently propelled as a rocket by the release of combustion products, i.e., a “whoosh rocket.” My recommendation is that the standard fuel for pedagogical whoosh demonstrations be isopropanol, and the recommended vessel is the 3.8-L high-density polyethylene (HDPE) bottle.
REFERENCES
1.
J. J.
Fortman
, A. C.
Rush
, and J. E.
Stamper
, “Variations on the ‘whoosh’ bottle alcohol explosion demonstration including safety notes
,” J. Chem. Educ.
76
, 1092
–1094
(Aug.
1999
). 2.
“
4 Students Burned at Maple Grove Junior High
,” http://minnesota.cbslocal.com/2011/12/01/3-students-burned-at-maple-grove-junior-high-school/. 3.
Mark
Duell
, “‘I was on fire’: Four students burned when science teacher’s experiment goes horribly wrong
,” http://www.dailymail.co.uk/news/article-2069210/Four-students-burned-science-teachers-experiment-goes-horribly-wrong.html. 4.
Chris
Williams
, “Experts: Little oversight of Minn. classroom science labs
,” MPR News
, http://www.mprnews.org/story/2011/12/11/class-lab-safety. 5.
Alicia
Miller
, “State Fire Marshal closes case in Maple Grove Junior High
,” Sun Post
(June
11, 2012
), http://post.mnsun.com/2012/06/11/state-fire-marshal-closes-case-in-maple-grove-junior-high/. 6.
“
Expt: The ‘Whoosh’ bottle demonstration
,” http://www.rsc.org/learn-chemistry/wiki/index.php?title=Expt:The_%E2%80%98Whoosh%E2%80%99_bottle_demonstration&oldid=4345. 7.
“
Whoosh Bottle Safe Laboratory Practices
,” Flinn Scientific
, https://www.flinnsci.com/media/484580/95010-r.pdf. 8.
“
Whoosh Bottle—Classroom Demonstration Video, VP01
,” http://www.esa.int/spaceinvideos/Videos/2014/07/Whoosh_bottle_-_classroom_demonstration_video_VP01. 9.
D. J.
Campbell
, “An alcohol rocket car—A variation on the whoosh bottle theme
,” J. Chem. Educ.
78
, 910
–916
(July
2001
). 10.
“
Ethanol Rockets
,” http://www.rsc.org/eic/2013/10/exchem0313-ethanol-woosh-rocket-methanol. 14.
“
Whoosh Rocket
,” http://www.estesrockets.com/002232-altitraktm. 15.
See [supplementary material] available under the “References” tab at TPT Online, http://dx.doi.org/10.1119/1.4972494 .
16.
S. R.
Turns
, Introduction to Combustion: Concepts & Applications
, 3rd ed. (McGraw-Hill Education
, India
, 2012
). 17.
“
Chemical Sampling Information
,” https://www.osha.gov/dts/chemicalsampling/toc/toc_chemsamp.html. 18.
R. B.
Gregory
and M.
Lauber
, “Whoosh bottle safety, again: What about what is inside?
” J. Chem. Educ.
89
, 620
–623
(Feb.
2012
).© 2017 American Association of Physics Teachers.
2017
American Association of Physics Teachers
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