Originally Posted by flyzabit
The chemical reaction of dry ice (frozen CO2/carbon dioxide) in exposure to "air" is such that it removes oxygen from the airspace upon oxidation.
Oh stop it, there is no chemical reaction. It is simple physics, as the dry ice sublimates in a confined space the pct of oxygen drops. Nothing is being 'removed' nor is there a reaction.
In a ventilated environment (an aircraft cabin) reasonable amounts of dry ice are a non issue.