Eli5 How come bubbles only appear in carbonated drinks AFTER you open them?

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Idea created from sparkling water

In: Physics

4 Answers

Anonymous 0 Comments

The amount of gas that can dissolve in water depends on the pressure of the gas (each gas is dissolves separately if there is a mix). You can think about it in the same way that hot water can hold more salt or sugar than cold water can. Sitting on the shelf a carbonated bottle is pressurized to about three times normal atmospheric pressure and it’s all CO2. This is about 5000 times the normal pressure of CO2 in the atmosphere, so the liquid will have 5000 times more dissolved CO2 than a glass of water set out on the counter.

When you open the bottle, you depressurize it to normal atmospheric pressure and all that gas can’t stay in the liquid anymore and forms bubbles as it escapes.

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