Does bioethanol present an explosion risk?
No more so than petrol does. Only the vapors from a liquid fuel are able to burn (if oxygen is present), and in the case of free fuel on the ground it is the vapor above the fuel surface that burns. This is true for both petrol and bioethanol, and both liquids are extremely flammable. If spilt after a collision, petrol will be more dangerous than bioethanol due to its higher vapor pressure in open air.
