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Asked by megannldnn to Darren, Deuan, Duncan, Lori-An, Michelle on 17 Jun 2010 in Categories: General.
Question: Hey hey hey! i was wounering, why bubbles in a drink only flow upwads, and only start to bubble when the bottle is opened?
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Darren Nesbeth answered on 15 Jun 2010:
When the drink goes into the bottle, it is at high pressure so the gas dissolves in the drink.
Opening the bottle lowers the pressure again, so the gas ‘comes back out’ of the drink.
The gas is lighter than the drinks, so floats to the top.
Lets hope a physicist doesn’t read that!
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Duncan Hull answered on 15 Jun 2010:
Bubbles float upwards in drinks because they are lighter (less dense) than the liquid they are contained in. In a can of fizzy drink, the bubbles only start to bubble when the drink is opened because the pressure in the drinks can keeps them dissolved in the liquid. When you open the can, the pressure drops, and the gas comes out of the liquid solution as bubbles.
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Lori-An Etherington answered on 17 Jun 2010:
Hello, bubbles in a drink float upwards because the bubble is less dense (this means that the air inside the bubble is ‘lighter’) than the surrounding liquid, so the pressure below the bubble pushes it upwards. Fizzy drinks contain carbon dioxide gas which is dissolved in the liquid by pressurising the contents of the can. When the can is opened, the mixture depressurizes and the carbon dioxide comes out of solution, escaping as carbon dioxide gas in bubbles.
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Deuan Jones answered on 17 Jun 2010:
Fizzy drinks contain gas which is kept in the drink by pressure. So when you open the bottle and let the pressure out, more gas comes out of the drink untill the pressure builds up again (like if you put the lid back on). They go upwards cos the gas is lighter than the liquid.
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