9. James Watt
- Most Famous For Inventing: Watt Steam Engine, International System Of Units (SI Unit Of Power)
James Watt is a chemist and mechanical engineer that became one of the world’s greatest inventors during his life. He invented the Watt Steam Engine, a major improvement on previous steam engines. The way it differed was through his separate condenser. This helped to make the steam engine more energy efficient as it had been wasting more by having to repeatedly cool and heat the cylinder.
Although his steam engine was a massive innovation, it took time to become a commercial success. Companies had to give it a try, which they were hesitant to do. Upon doing so, people loved it and it became THE steam engine used throughout Europe. In his later years, he developed the concept of horsepower as well as the International System of Units and its unit of power, known today as the SI unit of power. “The Watt” would be included later on as part of this, which is to honor SI’s founder.