The design of a microwave popcorn bag is specifically keyed to avoid popped kernel scorching, an undesirable effect that takes place when popped kernels are heated above 300 °F (149 °C).[1]Oh, and also: nuke for 2 minutes. Do this in my microwave, and you now have slightly hot, utterly unpopped popcorn kernels. Enjoy!
A susceptor, usually a metallised film laminated onto the paper of the bag, absorbs microwaves and concentrates heat at the film interface, thus ensuring a heat distribution focused on the hard-to-heat flavor coating so that the unpopped kernels are evenly coated prior to popping, thereby ensuring even flavor throughout the product.
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posted by HopperFan at 6:38 AM on August 9, 2010 [1 favorite]