What causes root beer to foam when creating a float?

You put the vanilla ice cream in the glass first and then pour the root beer into it. Then it begins to foam upwards. Do you think that the sugar in the ice cream causes this to happen?|||the cold ice cream causes the soda molecules to become closer together and squeeze out some of the CO2. The CO2 bubbles dont pop once they reach the surface because they are lined with fat from the ice cream|||The carbination in the root beer is reacting with the proteins in the cream of the ice crean. The super cold protiens and the warm co2 enhanses the react that is why it doesnt occur as much if you put cold soda in warm cream.|||When you add the ice cream, you drop the temperature of the drink. The lowering of temperature makes it even more inhospitable for the great excess of gas molecules to remain in solution and you get more bubbles rising to the surface. The same effect happens when you add ice cubes, *except* that you don't see so much foam. In addition, some of the ice cream melts and "goes into solution," namely, it dissolves in the soda and can further displace gas molecules in solution.|||Root beer if good has Hops in it like beer does. so foam away with it!!!|||I don't know. I often wonder the same thing. I'm always overflowing my floats. I have 1-2 floats a day- no lie. I'm an addict. But, because I live in Korea there is no Rootbeer. I have coke floats.





sorry I couldn't be more help.|||Since the ice cream and the cup/glass are very different temperatures the bubbles of the foam are different sizes which causes the foam to increase is size, and therefore you have foam which is really just the foam of coke not vallila ice cream|||the fat content from the ice cream coating the bubbles prevents them from bursting sooner, so they stack up on eachother.


(it's like whipped cream, just trapping air bubbles in fat.)





!Alexiis|||The foam causes it to foam up.|||I think it is the combination of sugar, the CO2 and the fat from the icecream that makes the bubbles. That would make a good "Good eats" episode.|||perhaps it is because it is a carbonated beverage.