I wash my hands with liquid soap every day.

Liquid nitrogen is very cold, so care must be taken when handling it.

Liquid oxygen is often used as rocket fuel.

This information is enough.

He thinks that war is a necessary evil.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

He was paying attention to the teacher's talk during the class.

He broke the glass carelessly.