Defining the Internal Combustion Engine
The internal combustion engine is a form of machinery in which the combustion of fuel and, in this case, a fossil fuel takes place with an oxidizer i.e. air. This process takes place inside the protective walls of a combustion chamber. The expansion of high temperature, high pressure gases due to the combustion leads to the propagation of force which is then applied directly to a movable component of the engine such as turbine blades. By applying this method over a distance, useful mechanical energy is thus generated.
Different from an internal combustion engine, the external combustion engine makes use of the natural resources such as air or hot water in such a manner that the energy created is delivered to a working fluid that is free from the contaminating products of the combustion process. As for which came first, the internal combustion engine or the external combustion engine, in my opinion, the external combustion engine came first. You will find conflicting answers on this on the internet, and these, too, do not look authentic as people just tend to leave their thoughts and opinions on BLOGs and forums.
When it comes to the fuel used for the efficient processing of the internal combustion engine, there are several answers. Some state that it ran on natural gas or coal, others state that an oil-based fuel was utilized, while some conclude that either ethanol or hydrogen were used. Since the source of these theories can’t be authenticated, one cannot be sure as to what form of fuel was primarily used. Maybe more than one fuel type was being utilized, or maybe there was only one main type of fuel for regular use, and the others were just used occasionally or for special purposes.
A big number of different designs of internal combustion engines have been built, each with a different level of strength and weakness. The early models of internal combustion engines consumed a lot of fuel, but people still bought them.