Why does rootbeer and cream soda foam?
- Thread starter sao123
- Start date
I don't know for sure, but if I had to guess, I'd say the answer has something to do with nitrogen.
DrPizza
Administrator Elite Member Goat Whisperer
The water is carbonated, but the can/bottle may be pressurized with nitrogen. At least, this is how I do it when I make root/birch beer. Force-carbonate with normal CO2 and then I pressurize the draft bottle with both nitrous and CO2, which makes it creamier and allows you to have a foamy head.
But I honestly have no idea how it's done in mass-production...just a half-assed educated guess.
DrPizza
Administrator Elite Member Goat Whisperer
MrPickins
Diamond Member
- May 24, 2003
- 9,124
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IIRC, some of the natural flavorings in root beer contain surfacant molecules that help promote the foam by lowering the solution's suface tension.
The foaminess also varies from brand to brand, probably because of different amounts of the ingredients containing surfacants. For example: Barq's has verry little foam (for root beer), while IBC has a nice head. (IBC FTW
)
Edit: I ken spel.
The foaminess also varies from brand to brand, probably because of different amounts of the ingredients containing surfacants. For example: Barq's has verry little foam (for root beer), while IBC has a nice head. (IBC FTW
)Edit: I ken spel.
- May 27, 2002
- 12,653
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- 106
Originally posted by: MrPickins
IIRC, some of the natural flavorings in root beer contain surfacant molecules that help promote the foam by lowering the solutions suface tension.
The foaminess also varies from barnd to brand, probably because of different amounts of the ingredients containig surfacants. For example: Barq's has verry little foam (for root beer), while IBC has a nice head. (IBC FTW
yea I noticed that too...
A&W seems to have the thickest foam, while mug is about half foam, half bubbly fizz.
It depends on the brand, most soda has an anti-foam agent in it. Some has none, or some more than others.
Some has more carbination than others, for instance Barq's is made by Coke, it has more C02 in it than say Mug which is produced by Pepsi. I know I worked for Pepsi and Pepsi used to make Barqs before Coke bought the rights.
The amount of the various ingredients and how they react with one another also plays a role.
Some has more carbination than others, for instance Barq's is made by Coke, it has more C02 in it than say Mug which is produced by Pepsi. I know I worked for Pepsi and Pepsi used to make Barqs before Coke bought the rights.
The amount of the various ingredients and how they react with one another also plays a role.
Jeff7
Lifer
- Jan 4, 2001
- 41,596
- 19
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Why does water have strong surface tension but rubbing alcohol, another clear liquid, not?
Just something about root beer or cream soda's molecular structure lets it form longer-lasting bubbles. Cola has medium-lived bubbles, and orange soda's bubbles pop almost immediately. Just the way it is. Maybe a chemist would know the specific molecular components responsible.
Just something about root beer or cream soda's molecular structure lets it form longer-lasting bubbles. Cola has medium-lived bubbles, and orange soda's bubbles pop almost immediately. Just the way it is. Maybe a chemist would know the specific molecular components responsible.
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