skip to content skip to search skip to navigation Listen Live skip to logon
Saturday 25th October 2014
Max 14°C | Min 11°C

Why Does The Head on a Pint Taste So Much Worse?

Question

Why does the head on a pint taste so much worse than the rest of it... whereas it doesn't in pop?
Matt, Clapham

Answer

**definitive**
Name: Mike, Maida Vale
Qualification: Chemical engineer dealing with foam (although usually with crude oil)
Answer: Foam on ale is 'stable' foam and lemonade is 'unstable' foam - to do with the speed it disapates. The reason a foam is stable is it has surfactants that like the interface between the foam and the liquid. They congregate between gas and liquid so have a higher concentration on the foam than in the liquid. It is these that taste bad and they only form in this way in stable foam.

 

Disagree? Write your answer in the box below...

 

 

 

Comments