Definitions for "Expansion chamber"
A place for liquid CO2 to expand into a gas to keep the liquid out of your gun.
on hot water dispensers, a separate chamber into which expanded water flows as it is heated (and from which it is subsequently drawn out again during activation).
A device that lets CO2 expand to a consistent gas state instead of a liquid form. When CO2 is charged into a canister it becomes a liquid. CO2 gas delivers much better performance than it's liquid form.
An Expansion chamber is an exhaust system used on a two-stroke cycle engine to enhance its power output by improving its volumetric efficiency. It makes use of the energy left in the burnt exhaust exiting the cylinder to aid the filling of the cylinder for the next cycle. It is the two-stroke equivalent of the tuned pipes (or headers) used on four-stroke cycle engines.