Harald Kylin is a person who lived a long time ago and did something very important in the field of chemistry. He studied how different things react when they come into contact with each other. This is important because it helps us understand how to make new things and how to use chemicals safely.
Harald Kylin was born in Sweden in 1889 and went to school to study chemistry. He was really interested in studying how different chemicals interacted with each other, and he spent a lot of time doing experiments to figure this out.
One of the things that Harald Kylin is most famous for is something called the Kylin-Ziegler reaction. This is a reaction that happens when two different chemicals come into contact with each other. Harald Kylin studied this reaction and figured out how to control it, which was very important for making new types of chemicals.
Harald Kylin also worked on figuring out how to make plastic, which is something we use every day. He discovered a way to make a type of plastic called PVC, which is used in things like pipes and window frames.
Overall, Harald Kylin was a very important person in the field of chemistry because he helped us understand how different chemicals react with each other and how to make new and useful things.