1. Increasing the size of a piece of Popcorn 안용열 저널클럽 2004.9.21.

2. What is ‘Popcorn’?

3. Popcorn is very famous food When we watch movie.. An average american eats 59 quarts(~56 liters) of popcorn every year. Popcorn shrimp --;

4. Contd. He appeared as a photographer in the drama “ popcorn ” before “ the tale of autumn ” Popcorn art.. They sell it! They like it, too

5. .. And ancient food http://www.goodbrush.com America may be the first place where people eat popcorn. Indians introduced the popcorn to europeans Indians used the popcorn even as an accessory!

6. .. It means that it’s easy to make ?

7. How to make a popcorn --;;

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

9. How to make a popcorn (contd.)

10. “A Corn kernel” Moist starch

11. “A Corn with oil” on fire heat FIRE ~_~a

12. Inside a corn with oil on fire Water turns into vapor pressure

13. Bang!! Starch + Water vapor P_Y P_0

14. 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?

15. Then, How to measure the ‘quality’ of a popcorn? Records

16. Adiabatic expansion (gamma for water vapor = 1.3) At time = 0 At time t_f when the expansion stops, P_Y P_0

17. Theoretical Result As P_0 gets lower, the final popcorn volume gets larger (so obvious ^^;;)

18. Popcorn Experiment Dry(Mesh) vs. Oil popping

19. Experimental Result

20. How to eat a sweet popcorn? http://www.popweaver.com/recipes.htm : recipeshttp://www.popweaver.com/recipes.htm http://www.popcorn.org/frames.cfm?main=encyclopedia/index.cf m : recipeshttp://www.popcorn.org/frames.cfm?main=encyclopedia/index.cf m 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.

21. 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!

22. 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).Nature,362,417 Daniel C. Hong and Joseph A. Both, Controlling the size of popcorn, PhysicaA,289,557 (2001).PhysicaA,289,557 Paul V. Quinn Sr., Daniel C. Hong, and J. A. Both, Increasing the Size of a Piece of Popcorn, 0409424, (2004). 0409424, www.google.co.kr