Popping Corn Essay

289 Words2 Pages
Popping corn Aim: Which corn makes the best pop corn crushed or non-crushed Materials: • Saucepan with glass lid • Cooking oil • Popping corn • Pliers Method: 1. Use the pliers to gently crush but not break up half the corn. 2. Cook crushed corn and then the uncrushed corn. Result: The non-crushed corn worked the best. The crushed corn work but it brut, the non- crushed corn did not burn Discussion: We found that the crushed corn worked better than the non-crushed corn. Conclusion: The crushed corn worked but not to the standards of the non-crushed corn, there so the non-crushed corn worked loads better than the crushed corn The science behind popping corn: Popcorn goes pop because as you heat it up the moisture inside also gets hot and would like to turn into steam. Yet the hard surface coat of the kernel can support up to 10 atmospheres of pressure, stopping the water expanding into steam. The water keeps heating up above 100°C, building up more and more pressure. As it heats up the moisture in the kernel alters the starch stored inside forming a kind of jelly. Then the temperature can boost to 180°C. This increases the pressure inside the shell enormously, causing the shell to split and release the pressure. The drop in pressure causes the water in amongst the jelly-like starch to boil immediately, expanding by a factor of 1-2000 or more. This blows the jelly into the foam which we call popcorn. As all the water in the starchy jelly has now boiled off the starch dries out, becomes hard and can support itself even when the popcorn cools down and the water condenses

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