Scroll down to bottom of this page to see the explanation for the diving raisins Mad Science of the Bay Area offers a large selection of after-school, preschool, summer and vacation programs, workshops, special events and birthday parties, as well as Scout programs and fun stations. From entertaining educational programs to educational entertainment, Mad Science sparks imaginative learning. All Mad Science programs are animated at your location by highly-trained professional instructors equipped with awe-inspiring gear. And, we come to you! Click an Icon, or use the menu to the left for more information on our many exciting programs, camps, special events, and parties.

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What's Going On ?

Diving Raisins Experiment

When combined, vinegar and bicarbonate of soda create a chemical reaction that produces carbon dioxide (CO2) gas.  Some gas will dissipate in the water and some will escape out through the surface. When the raisins are added, they sink to the bottom because of gravity and because the are denser (heavier) than water.  The small bubbles of carbon dioxide gas will attach themselves to the raisins and because CO2 bubbles are less dense (lighter) than the water, they act as flotation devices.  The raisins then begin to rise.  As they reach the surface, the small bubbles of carbon dioxide gas are released.  With their "flotation devices" gone, the raisins then sink to the bottom and the cycle begins all over again.  It is these bubbles that pop at the surface of carbonated beverages like cola and root beer and tickle your nose when you take a drink.  As you drink carbonated beverages all the little CO2 bubbles get together and form big CO2 bubbles in your insides and are released in a BURP!