If the liquid comes in contact with the air, it will explode.

It no longer came and went with the moving air, which meant the riders were on the right course.

Those obligations came with the air, which suddenly seemed heavy in this windowless room.

They were written with a secret ink, which disappeared shortly after it had come in open contact with the air.

He came into the room with the air of a messenger.

The door had opened suddenly, and a young fellow came swaggering in with the air of one who is the master.

The cooled moist air never comes in direct contact with the conditioned air.

The silk solidifies when it comes in contact with the air.

The Shadow's ink had a faculty for disappearing shortly after it came in contact with the air.

When your breath leaves your warm body, and comes in contact with the cold air, it is immediately cooled.