Dancing Raisin

Hmm you like rum and raisin? Then have you tried 7up with raisin? Have you wonder why your raisin will "dance" in your 7up? It will flow up and down right? The theory is very simple, this is because the gas in the soft drink pushes the raisin up and when the gas bubbles pops, it will not be able to hold on to the raisin and the raisin will drop down.

It is best if you can get raisin that is very dry as the drier the raisin, the raisin will be more wrinkled and light so as to create more surface area for the gas bubbles to push the raisin up.

Alternatively if you do not have soft drink at home, you can try to put 2 teaspoons of baking soda in around 100ml of water, dropped your raisin inside and then add some vinegar into it. Effervescence will be observed once vinegar is added as vinegar which is an acid will produce cardon dioxide when react with carbonate. This carbon dioxide gas will forms into bubbles and pushes the raisin up.

So have fun and take a look at the video which I took myself that shows the raisin moving up and down.