Discussion
Fuel vapour stored while a vehicle is parked is held in a _____ canister.
Answer: C
Correct answer: carbon
The canister is filled with activated carbon, whose very large internal surface adsorbs the fuel vapour escaping from the tank while the vehicle is parked.
When the engine runs under suitable conditions, air is drawn through the canister to desorb the vapour and carry it to the intake, where it is burnt. The same adsorption principle serves organic vapours in air cleaning generally - the carbon holds the molecules until conditions favour their release.
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