Nuclear tests pose a great threat to world peace.

This is our new experimental project.

These experimental results support our hypothesis.

He is trying a new chemical reaction on the laboratory testing bench.

The experimenter analyzed the data in detail.

This experimental device is used to create new substances.

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.

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