What are the advantages and disadvantages of solid,liquid,gaseous fuels?
Solid is not very useful because of the difficulties of moving it from the storage tank to the combustion chamber. Power plants that burn coal crush it to a powder first, as that can be pumped and handled almost like a liquid. Late model steam locomotives used the powder or used coal in small pieces and transported it via a screw conveyer. Gas is not that useful either, as you have to compress it or liquify it to store any significant amount of fuel, and then the storage for compressed gas becomes very heavy, or the storage for liquified gas becomes power intensive to keep it liquid. Liquid has the advantage of being easy to store and easy to move and pump and inject into the combustion chambers. .
