I can't forget the day when I first shared an umbrella with him.

Water turning into ice is an example of a phase transition.

They were put in a situation of confrontation.

He is studying about Einstein's theory of relativity.

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.

This electric motor is using three-phase power.

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