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There must be a portable pressure gauge available for such things. If you don't have access to one I'll be happy to help. Unfortunately I work with 5-30L reactors and only the 20-30L reactors have pressure gauges on them. If you'd like to supply a hundred litres of each brand you're interested in testing, I'll give you a solid number for their headspace pressure. No no no, you're very welcome! I'm more than happy to help. Giddily, Craig Sent from my iPhone On 19 May 2017, at 18:10, Dr Stuart Farrimond <[log in to unmask]<mailto:[log in to unmask]>> wrote: Hello fellow psci-comers, An interesting Friday question for you. For the celebration of all things scientific and ale-related, I am trying to come up with a way to figure out which brand of beer is the ‘fizziest’. Aside from purely subjective tasting, does anyone have any good ideas on how to quantify the fizz/carbonation within a bottled/canned ale? The most obvious method would be to put a balloon over the top of a bottle, although I dare say this will yield very meaningful results… Over to the great collective mind! Stu Farrimond ********************************************************************** psci-com how-to: Once subscribed, send emails for the list to [log in to unmask]<mailto:[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]<mailto:[log in to unmask]> To unsubscribe (or silence messages while away) send an email (any subject) to [log in to unmask]<mailto:[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]<mailto:[log in to unmask]> Small print and JISCMail acceptable use policy https://sites.google.com/site/pscicomjiscmail/the-small-print ********************************************************************** ********************************************************************** 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 **********************************************************************