Question

whywood charcoal is is used as fuel​

Answer 1

Due to its high adsorbing capacity, wood charcoal is used as gas masks to adsorb harmful gases

Answer 2

Charcoal is a lightweight black carbon residue produced by strongly heating wood in no or very little oxygen (or other animal and plant materials) so as to drive off all water and other volatile constituents. In the traditional version of this pyrolysis process, called charcoal burning, the heat is supplied by burning part of the starting material itself, with a limited supply of oxygen. Charcoal can also be produced by heating the material in a closed retort.