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

PET plastic bottles of carbonated drink leak their air over time. The bottles only have a shelf life of a year.
Manufacturers over pressurise bottled to try and account for this.
This is why some people like cans, glass bottles and soda streams, they are more consistently carbonated.
This extra gas/fizz causes overflows when pouring.