LiOH Canister
A LiOH canister is a device used in spacecraft to remove carbon dioxide from the air. It contains lithium hydroxide (LiOH) which reacts with carbon dioxide (CO2) to form lithium carbonate (Li2CO3) and water (H2O). The canister is designed to be replaceable and is typically located in the Environmental Control and Life Support System (ECLSS) of the spacecraft. The removal of carbon dioxide is important for maintaining a habitable environment for the crew. The LiOH canister was famously used in the Apollo 13 mission to remove excess carbon dioxide after an explosion damaged the spacecraft.
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