How does temerture affect the fizz in pepsi and coke?

Answer 1

The 'fizz' comes from carbon dioxide (CO2) which is absorbed into the water in the drink.

CO2 is absorbed and retained better in cold water than it would in warm water, and is given off quite quickly from warm water. This will be very well demonstrated by carefully pouring a small amount of the drink into a hot saucepan - it will froth up very quickly because the CO2 is being released very quickly.

If you open a warm can of carbonated drink it will probably spurt all over the place, wheras a cold can will not do this (unless someone has given it a good shake !! - but that is a different issue !!)

Cold cans are more refreshing to drink because of the cooling effect in your mouth and throat and the fizz sensation is enhanced by the cold water which holds more CO2 suddenly releasing the CO2 when it comes into contact with your warm mouth.

Hope that helps.