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.

He likes to take a walk in the park at dusk.

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.

He is an expert in experimental psychology.

He is spending a lot of time on experimental research.