system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If carbonated drinks are stored similarly in canisters for fountains and aluminum cans, why does the fizz lost much quicker when transferred?

Fountain drinks stay fizzy longer. Canned drinks poured into glasses/solo cup lose fizz rapidly. Why?
gpt
Carbonated water loses the mixed CO2 in direct relationship with the amount of surface area the liquid has at any given point in time. Fountain drinks have the benefit of having been immediately carbonated by the fountain (since that's what a fountain does - carbonates water and mixes with syrup to produce a drink), and at most fountains the amount of injected CO2 is pretty high to make up for the fact that a ton of it is lost on impact (i.e. the drink from the fountain hitting the bottom of the cup). 

Most canned/bottled drinks aren't carbonated as much because carbonation increases the pressure inside the container, and if you add too much carbonation the can or bottle will explode when you shake it (worse than it does normally).