The invention of the steam engine by the British in 1769 was an unprecedented event in human history. The steam engine helped pave the way for massive imperial expansion worldwide. With its help, the British expanded their rail network. This steam engine was based on an 'external combustion engine' system, where fire was applied externally, and the resulting energy turned pistons to operate the machine. The energy efficiency rate of this engine was 23 percent.Thereafter, the world transitioned from the 'external combustion engine' to the 'internal combustion engine.' In this system, fuel was injected inside the engine to generate energy. By...