Does anyone know why the bubbles in a jd and coke disappear?

[andrew_huxtable]

because a vodka and coke stays fizzy, i know as i have a one beside me!!

[Airbag]

Because I drank it?

[Sgt Bilko]

Stop looking at it and drink it

[bigmac146]

down it down it

[OllieC]

its not for drinking, its just for looking through.