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Hi, Consensus is to measure CO2 by displacement, comme ca: http://sciencing.com/measure-soft-drinks-science-project-5731377.html Note however that the CO2 will take a long time to come out, so we might take a leaf out of the Coke fountain's book and add nucleation sites e.g. Roughened mints (or at the risk of wasting beer, Francis' point notwithstanding, adding sand) to speed up the gas bubble formation: https://en.wikipedia.org/wiki/Diet_Coke_and_Mentos_eruption HTH, MARK FERNANDES Quadram Institute Bioscience, Norwich Research Park, NR4 7UA T: +44 (0)1603 255000 D: +44 (0)1603 255186 [log in to unmask] www.quadram.ac.uk Institute of Food Research has transformed into the Quadram Institute Bioscience as the first step to realising the vision of the Quadram Institute, due to open mid 2018. ********************************************************************** psci-com how-to: Once subscribed, send emails for the list to [log in to unmask] If not subscribed, either subscribe here https://www.jiscmail.ac.uk/cgi-bin/webadmin?A0=psci-com or send requests for items to be posted on your behalf to [log in to unmask] To unsubscribe (or silence messages while away) send an email (any subject) to [log in to unmask] with one of the following messages (ignoring text in brackets) • signoff psci-com (to leave the list) • set psci-com nomail (to stop receiving messages while on holiday) • set psci-com mail (to resume getting messages) Contact list owner at [log in to unmask] Small print and JISCMail acceptable use policy https://sites.google.com/site/pscicomjiscmail/the-small-print **********************************************************************