十万个为什么·科学启蒙30篇（2）
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Why Does Chewing Gum Stay Chewy Instead of Dissolving Like Candy?
为什么口香糖嚼起来有弹性，不像糖果那样溶解？
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Chewing gum stays chewy because its base is made from synthetic or natural polymers that resist saliva.
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Unlike sugar or chocolate, these rubber-like substances don’t break down easily in water or enzymes.
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Modern gum uses food-grade elastomers such as styrene-butadiene or polyvinyl acetate.
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Sweeteners and flavorings dissolve quickly, but the gum base remains intact during chewing.
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Saliva moistens the surface but cannot chemically react with the polymer chains inside.
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That’s why swallowed gum passes through your digestive system unchanged, just like fiber.
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Heat makes gum softer, while cold makes it stiff—but it never truly melts like ice or butter.
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Scientists test new bases to make gum biodegradable without losing its fun, stretchy feel.
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Flavor lasts only minutes because volatile oils evaporate or dissolve long before the base does.
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You can stretch, blow bubbles, or fold gum because its molecular structure is both elastic and cohesive.