He is learning about the handling of experimental animals.

He decided to become a subject of the human experiment for the new drug.

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.

He was born as an illegitimate child and experienced many difficulties.

My grandfather used to till his privately-owned rice field.

Using the private railway makes commuting very convenient.