Interesting article on a new nightspot in Pittsburgh. Presumable he's not serving glasses of foam, champagne can be served at upwards of 7 volumes of CO2.
http://www.post-gazette.com/stories...-latest-spot-to-boost-its-revival-647244/?p=0
http://www.post-gazette.com/stories...-latest-spot-to-boost-its-revival-647244/?p=0