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					Increasing the size of a
   piece of Popcorn

           안용열
         저널클럽 2004.9.21.
What is „Popcorn‟?
Popcorn is very famous
         food
When we watch movie..




        Popcorn shrimp --;
                             An average american
                             eats 59 quarts(~56 liters)
                             of popcorn every year.
      Contd.
He appeared as a photographer
in the drama “popcorn” before
“the tale of autumn”
                They like it, too


Popcorn art..
They sell it!
        .. And ancient food
                           • America may be the first
                           place where people eat
                           popcorn.

                           • Indians introduced the
                           popcorn to europeans

                           • Indians used the popcorn
                           even as an accessory!


http://www.goodbrush.com
.. It means that it‟s easy to
           make



            ?
How to make a popcorn




                 --;;
How to make a popcorn
       (contd.)




                 --;;
How to make a popcorn
       (contd.)
“A Corn kernel”




 Moist starch
“A Corn with oil” on fire




       FIRE ~_~a
heat
    Inside a corn with oil on
              fire

                   pressure

Water turns into
vapor
            Bang!!
P_0



      P_Y


                    Starch
                 + Water vapor
            Basic Idea
• Water vapor expands rapidly when a
  corn is popped.

• Therefore, this is close to a perfect
  adiabatic process.

• How to make a „good‟ popcorn?
 Then, How to measure
the „quality‟ of a popcorn?




Records
      Adiabatic expansion

                 (gamma for water vapor = 1.3)
At time = 0
                                        P_0

At time t_f when the expansion stops,         P_Y
   Theoretical Result



As P_0 gets lower, the final popcorn
volume gets larger (so obvious ^^;;)
Popcorn Experiment




Dry(Mesh) vs. Oil popping
Experimental Result
How to eat a sweet popcorn?
  • http://www.popweaver.com/recipes.htm : recipes
  • http://www.popcorn.org/frames.cfm?main=encyclopedia/in
    dex.cfm : recipes
  • Keep corn kernel in the airtight container. (Because without
    moisture, the kernel can‟t pop)
  • Rehydrate “Old maids”
   Do you want to lose some weight? Then use dry popper(air,
   mesh, microwave) without seasonings. (only 30 calories per
   cup) Or use this.
             강냉이?
• It‟s a different kind of corn
• The name came from 강남 in China
• It doesn‟t pop in the normal air
  pressure.
• We must use popping machine which
  control the pressure.
• High p  Low p : POP!
                References
• www.popcorn.org
• W. J. da Silva, B. C. Vidal, M. E. Q. Martins, H. Vargas, C.
  Pereira , M. Zerbetto & Luiz C. M. Miranda , What makes
  popcorn pop , Nature,362,417, (1993).
• Daniel C. Hong and Joseph A. Both, Controlling the size of
  popcorn, PhysicaA,289,557 (2001).
• Paul V. Quinn Sr., Daniel C. Hong, and J. A. Both,
  Increasing the Size of a Piece of Popcorn, 0409424, (2004).
• www.google.co.kr

				
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posted:11/8/2011
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