Coke Can Eruption

I can never forget the baffled faces of Maths n Science Club members when they were asked to open their coke can after shaking it vigorously.Everyone held their cans as far as they could from them-scared that the drink will spurt out.But for our great surprise...the drink did not spurt out.So lets see how does it work.

What You Need
-A fizzy drink

What To Do
First,shake the can vigorously.Then tap on top of the can 15-20 times.Now open the can and you notice that the drink did not spurt out.

How Does it Work
Fizzy drinks are fizzy because they have loads of carbon dioxide dissolved in them under pressure.If you have shaken the drink you will have mixed a whole lot of bubbles into the liquid.These bubbles have already started so if you open the drink immediately,the bubbles can expand rapidly creating foam.The foam is much larger than the can so the drink will spurt out.So by tapping the can it will dislodge the bubbles and therefore less amount of foam is produced.