Ok kiddo, imagine you are playing with some blocks. You have some red blocks and some blue blocks. You can put them together to make something new. Now let's imagine that the red blocks are like heat and the blue blocks are like pressure. When you put them together, they can make something new happen.
The Thomsen-Berthelot principle is a rule that helps us understand how heat and pressure can change things. It says that when you change the temperature and pressure of a substance, it can change into something new. Just like when you change the blocks around to make a new toy.
Now, let's say we have water in a container. If we increase the pressure on the water, it can turn into steam. And if we decrease the pressure on the steam, it can turn back into water. This is called a phase change. The Thomsen-Berthelot principle helps us predict when phase changes will happen for different substances.
So the next time you play with your blocks, remember that heat and pressure can make something new happen just like the Thomsen-Berthelot principle helps us to understand.