He is a famous author and a person who is respected by many people.

This festival is held every year.

The experimenter analyzed the data in detail.

He is an excellent chemist who made many discoveries.

This compound is made through a sulphuration process.

The chemist conducted an experiment to sulphurate iron.

This iron has been used since ancient times.

He is majoring in chemistry at university.

We conducted a new experiment in science class.

This sword is made of iron.