Julius Thomsen was a man who lived a long time ago and was very interested in chemistry. He spent a lot of time studying how different things react with each other and how they can make new things.
One thing that Julius Thomsen discovered was that electricity can make a big difference in how chemicals react. He studied this by putting different chemicals into water and then passing an electric current through the water. When he did this, he saw that the chemicals combined in different ways than they did without electricity involved. This was a big discovery in the world of chemistry!
Julius Thomsen also discovered something called the law of thermochemistry. This is a fancy way of saying that the amount of heat energy released or absorbed when chemicals react is always the same. This was a very important discovery because it helped scientists understand more about how chemicals work and how they can be used to make new things.
Overall, Julius Thomsen was a very smart man who made some big discoveries in the world of chemistry. His work helped us understand more about how chemicals react with each other, and it still helps scientists today!