Depending on the size of your boat you may need more than one. Boats less than 26' have to have at least one B-1 fire extinguisher on board. Boats 26'-40' need to have at least two B-1 fire extinguishers on board.
Graphite is an electric conductor, consequently, useful in such applications as arc lamp electrodes. It can conduct electricity due to the vast electron delocalization within the carbon layers (a phenomenon called aromaticity).
Nov 25, 2016. . an carbon atom in graphite does not form 4 covalent bonds but only three in a hexahedral bidimensional structure. The last electron can move on all the plane, together with the fourth electron of the other carbon atoms. These are the electrons responsible of conduction current of the graphite.