十万个为什么·科学启蒙30篇（3）
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Soda Fizzes When You Open the Bottle
为什么可乐会冒气
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When I twist open a cold cola bottle, I hear a soft hiss and see bubbles rush upward.
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Those bubbles were trapped inside under pressure and now escape quickly into the air.
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If I shake the bottle first, more gas jumps out and foam spills over the top.
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My friend spills less by opening it slowly and holding it upright on the table.
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The fizz tastes sharp and refreshing, especially on hot afternoon picnics.
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Diet sodas sometimes bubble longer because they contain different sweeteners.
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I pour it into a tall glass so the bubbles have space to rise without overflowing.
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Carbon dioxide gives the drink its lively feel, but it disappears if left standing too long.
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At parties, we chill bottles in ice water so the fizz lasts longer in each cup.
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Even though it fizzes, I always sip it slowly to enjoy the cool, bubbly taste.