Carbonization is a type of chemical reaction where organic matter changes under high temperatures and in a state of oxygen deficiency, turning into a substance with carbon as its main component.

When this wood is carbonized, its strength increases.

He is majoring in chemistry at university.

Since it started raining, I opened my umbrella.

This chemical reacts when heat is added.

This chemical reaction is very dangerous.

He is an expert in chemistry.

He showed a change of technique in sumo.

In this company, he is in the lowest of the low positions.

Liquid oxygen is often used as rocket fuel.