– Description:
– First Fizz-Keeper-like device patented in 1926 by G. Staunton.
– T.R. Robinson and M.B. Beyer patented the Fizz-Keeper in 1988.
– Various styles of devices exist, including piston pumps and latch/hinge mechanisms.
– Some devices allow pouring without removing the Fizz-Keeper.
– The device does not claim to maintain carbonation.
– Research:
– Equilibrium CO concentration can be computed using Daltons law.
– Equilibrium CO concentrations are independent of air pressure.
– Henrys Law states that partial pressure in the container must be restored with the same gas.
– Pumping air into the bottle slows down CO out-gassing.
– Fizz-Keeper with pressurized air can extend CO retention for a short time.
– References:
– Joseph A. Schwarcz’s book “How does a Fizz Keeper keep the fizz in soft drinks?” (2004).
– John P. Williams, Sandy Van Natta, and Rebecca Knipp’s article on the Fizz-Keeper in the Journal of Chemical Education (2005).
– Brian Rohrig’s study on the Fizz-Keeper in ChemMatters (2002).
– Reed A. Howald’s case study on the Fizz Keeper in the Journal of Chemical Education (1999).
– Further Reading – Marketing literature and patents:
– Sackheads’ FAQ on fizzkeeper.org.
– US patent 4,723,670 by Tommy R. Robinson and Michael B. Beyer (1988).
– US patent 4,524,877 by Willard A. Saxby and Robert D. Pikula (1985).
– Further Reading – Educational uses:
– Brian Rohrig’s book “39 Fantastic Experiments with the Fizz-Keeper” (1999).
– Mark Talmage Graham’s article on investigating gases in The Physics Teacher (2002).
– M. Moloney’s “THE GAS MENAGERIE” and Steve Spangler’s “Marshmallow Masher” experiments.
– John P. Williams, Sandy Van Natta, and Rebecca Knipp’s article on the Fizz-Keeper in the Journal of Chemical Education (2005).
This article needs additional citations for verification. (July 2021) |
A Fizz-Keeper is a type of closure that is marketed as a way to keep carbonation in soft drinks. It consists of a small round hand pump that is screwed onto the top of a plastic soft drink bottle, which is then used to pump air into the bottle, preventing the drink from going flat.
Research into the Fizz-Keeper's mechanisms and processes has shown that the Fizz-Keeper, let alone pressurizing a soda bottle, does not actually prevent loss of carbonation, with its marketed claims being dismissed as pseudoscience.