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Chapter 12: Problem 125

As we know, if a soft drink can is shaken and then opened, the drink escapes violently. However, if after shaking the can we tap it several times with a metal spoon, no such "explosion" of the drink occurs. Why?

Short Answer

Expert verified
When a can is shaken, carbon dioxide bubbles form and spread through the drink. If the can is opened immediately, these bubbles force the drink out violently. Tapping the can after shaking causes the bubbles to dislodge and rise to the top. Opening the can then lets the bubbles out gradually, avoiding a drink 'explosion'.

Step by step solution

01

Physics Involved in Shaking the Can

When a soft drink can is shaken, the carbon dioxide gas inside gets distributed throughout the liquid. The gas forms bubbles that rise to the top of the can. When the can is opened right after shaking, these bubbles get released rapidly, forcing the liquid out of the can.
02

Effect of Tapping the Can

When the can is tapped with a metal spoon after shaking, the vibrations caused help to dislodge the bubbles from the sides of the can. This allows the bubbles to rise to the top of the can.
03

Opening the Can After Tapping

On opening the can after tapping it, the bubbles that have risen to the top get released gradually. Since the bubbles are not dispersed throughout the can, they escape in a controlled manner, preventing the violent escape of the drink.

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