He is trying to write an experimental novel.

He conducts research in the laboratory every day.

In order to find the empirical formula of this compound, you must first calculate the ratio of elements.

He is looking for a proving ground to test his new theory.

He conducted a thought experiment to solve a problem in physics.

The study of nucleons is an important field in science.

Nuclear fusion is expected to be a future energy source.

The cell nucleus holds genetic information.

If a nuclear war occurs, humanity will be extinct.