system
Given the following post, respond as if you're commenting on Reddit:
human
My daughter asked why are there bubbles in soda water.  I told her it's elves' farts.

Help me give her a scientific answer, it seems very hard to explain.
gpt
At the factory they pump gas called carbon dioxide into the soda water. They use a very strong pump that actually forces the gas to dissolve into the water, like when you disolve sugar in water. It squeezes the gas into the soda an it is trapped in there  for as long as the cap is on. 

Taking the cap off releases the pressure and the gas can escape from the liquid again - it forms bubbles.