Few months ago, the Rukun Tetangga organised a gotong royong, some games and a talk by the Fire Department (Bomba) on safety tips and how to use a fire extinguisher. Its the first time I see a fire demonstration. Its good to learn.
The white powder inside fire extinguishers is soda bicarbonate which is used in baking. The extinguishers should not be kept on the floor, but away from ground level, on top of a kitchen cupboard maybe.