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the only thing that comes to mind is yeast when you would make bread. yeast needs glucose (sugar) to "eat" and heat. yeast is activated at temperatures between 105 and 110 degrees Fahrenheit. any more than 110 will kill it. when the yeast undergoes alcoholic fermentation, it releases CO2, resulting in the air pockets when you slice the bread. hope this helps.

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16y ago

What else can I help you with?