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Don't know exactly, but it works better with diet coke

Take the lid of the bottle of Coke (Diet Coke works the best) and drill a hole in it. String half-a-dozen mentos together, leave a few inches of extra string. Empty the first couple inches of Coke out of the bottle. Put the string with the Mentos on it through the hole you drilled in the lid. Screw the lid back on the bottle. Let go of the string. You get the best gyser if you make sure that the hole in the lid is clean. You can also add other holes in the bottle for different effects. Check out this site for some cool ideas http://eepybird.com/

Open Diet coke. Put in 1/2 roll of Mentos and stand back.

for the best results, drill a 1/4" hole in the cap of a 2liter of diet coke, then take a toothpick and poke it through 5-6 mentos. THIS HAPPENS FAST SO you have to hold onto the mentos while you screw the cap on and then let them drop in after you have secured the cap! then watch it go!

Pour a tube of mentos in the coke.

put about 12 mentos in the coke bottle all at the same time, then stand back...

drop some mentos in a bottle of diet coke and watch it go!

you get a new 2 liter of coke and a package of mentos. put the mentos on a string and drop all of them in together and run away fast it will explode FAST!!!!!!

I believe it's diet coke. just drop the whole roll of mentos into the 2 liter bottle.............. and look out

its awesome, drop as many mentos into a bottle of diet coke and stand back......try using rolled paper to get them in there, its awesome!!