I want to know the answer to the following question:
What do you call the length of time that foam is on top of beer because of carbonation?
All the background I'm provided with is that "Hops have an antibiotic effect that favours the activity of brewer's yeast over less desirable microorganisms and aids in "head retention", the length of time that a foamy head created by carbonation will last.". Is that enough to answer the question?
Answer: yes