We ordered new materials for experiments.

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 conducted a thought experiment to solve a problem in physics.

Einstein proposed the theory of relativity.

He is an expert in theoretical physics.

Well then, I'm off.

He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

It is reported that North Korea has conducted another underground nuclear test.