The gas chamber was not an event.

a gas chamber or a air tight seal if you cant get your hands on a chamber

was Mustard gas used in U.S.M.C. boot camp gas chamber in 1973

Well it is possible that hana escaped the gas

chamber. changed her name so the Nazi's wouldn't recenize her.

But that is probably not true so she really died in the gas chamber.

When you release a gas in a vacuum chamber, it immediately drops to the floor because of its density.

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I expect that the gas will expand to fill the whole volume of the vacuum chamber.