chemeng Posted June 7, 2008 Share Posted June 7, 2008 why does the popcorn swells, which is the chemical that makes it to swell on heating? Link to comment Share on other sites More sharing options...
YT2095 Posted June 7, 2008 Share Posted June 7, 2008 H2o. Link to comment Share on other sites More sharing options...
iNow Posted June 7, 2008 Share Posted June 7, 2008 http://www.nasa.gov/audience/forkids/home/popcorn.html Only popcorn kernels can pop, and the secret is water. Each kernel contains a small amount of water stored in a circle of soft starch inside the hard outer casing. When heated to around 450? F, the moisture turns to steam, creating pressure within. As the pressure builds, the casing eventually gives way, and the kernel explodes and pops, allowing the water to escape as steam and turning the kernel inside out. Link to comment Share on other sites More sharing options...
Phi for All Posted June 7, 2008 Share Posted June 7, 2008 Chemistry thread moved from Engineering to... um, Chemistry. Link to comment Share on other sites More sharing options...
chemeng Posted June 9, 2008 Author Share Posted June 9, 2008 Function of pressure cooker? Link to comment Share on other sites More sharing options...
DrP Posted June 9, 2008 Share Posted June 9, 2008 Function of pressure cooker? Allows the boiling water to go over 100C whilst cooking at increased pressure. Thus a faster, hotter cook. Link to comment Share on other sites More sharing options...
chemeng Posted June 10, 2008 Author Share Posted June 10, 2008 it was very informative for me..... and for others tooo... thanks iNow Link to comment Share on other sites More sharing options...
iNow Posted June 10, 2008 Share Posted June 10, 2008 You are very welcome. Link to comment Share on other sites More sharing options...
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