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The secret to making popcorn is to maximize internal pressure in the popcorn before it pops. Pressure is provided by the steam from super-heated water in the cooking kernel. When you have enough pressure inside of the kernel, it's outer casing gives way, and the kernel explodes (pops) and all (most) of the super-heated water turns to steam. (for those of you who paid attention in physics/chemistry class, you'll realize that this sudden mass transition from liquid to steam also cools the kernel, which is why it doesn't go on to burn immediately after popping).
To get the perfectly popped kernel, you want a maximal distribution of heat into the corn before the casing gives way. If the heat is to low, the steam can leak out slowly, resulting in a less 'light' kernel than you really want. If the heat is too high (and/or unevenly distributed), only part of the kernel will be hot enough to pop, giving a partially popped kernel.
executive summary:The 'perfect' temperature and even heating are the goals of the gourmet popper