Why filling a cup at the soda machine the fizz doesn’t overflow but when filling a cup from a 2 liter the fizz is very volatile and over flows easily and both drinks taste like the same carbonation level.

Question

Wow so many different answers to this question and a lot sound like they could possibly be correct. So tonight I’m going to test the cold beverage theory. Will poring cold soda into my tumbler full of ice result in less fizz bubbles. Up until now I’ve only pored warm soda into the ice fill receptacle.

I will also test the suggestion to used watery ice instead of the cold dry ice right out of the freezer. Will the watery warmer ice result in less fizz. I will use my warm soda along with watery ice to see if I get a different result.

In: Chemistry

Answer 1

Bottled soda is under pressure. As the pressure increases, more gas will be held in the liquid before its saturated. I believe it actually becomes supersaturated, so the agitation from pouring it releases the gas.

Fountains add gas as you dispense, but because it isn’t under pressure, it can’t be supersaturated.

This is assuming that they’re identical temperatures.