Vapor (noun)

1. A substance in the gaseous state, especially one that is normally a liquid or solid.
2. A visible exhalation, especially an visible exhalation of water from the earth.

Origin:

From the latin word "vaporem" which means "steam".

Examples:

1. The vapor of the boiling water rose into the air.
2. The vapor of the perfume filled the room.
3. The vapor trail of the airplane was visible in the sky.
4. The vapor of the liquid nitrogen was very cold.
5. The morning vapor from the lake was beautiful in the sunrise.