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Why do bubbles appear in a glass of water over time?

Updated: 8/16/2019
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Indigoflow55

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14y ago

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As you leave a glass of water out, it warms. As it warms, various gasses (CO2, O2) become less soluble in it. Hence they escape from it in the form of these bubbles!

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Q: Why do bubbles appear in a glass of water over time?
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