In the chemical reaction, the closed container and the open container difference as follows the so-called closed container is refers to the external isolation of the container does not leak. The open container refers to the container and the outside world has the place to have the closed container in the middle school stage has two kinds: 1, is the volume invariable isobaric closed container 2, is the pressure invariable isobaric closed container. No gas exchange between a closed container and the outside world for example, experiments to prove conservation of mass can be carried out in a closed container with the participation or generation of gases, and correct conclusions can still be drawn