He is studying about Einstein's theory of relativity.

We are looking for new partnerships to strengthen our business contact.

This phase diagram shows the state of the substance.

This problem is equivalent to his ability.

Sotaro is my best friend.

The Minister of Internal Affairs and Communications announced a new policy.

In this chemical reaction, the gaseous phase plays an important role.

This compound is stable in the solid phase.

In this experiment, we will measure the temperature at which the substance becomes a liquid phase.

As the lunar phase changes, the night sky scenery also changes.