Where no mechanical means is used to provide air for combustion. Airflow into the combustion chamber is the result of warm air being less dense than cool air.

A gaseous fuel comprised mainly of methane; it is found beneath the earth's surface.

A naturally occurring mineral (Fe3O4) that has magnetic properties such as the ability to attract other magnetic materials and is affected by the earth's magnetic field

Having a negative charge. Group V, VI, and VII elements on the periodic table form negative ions and tend to accept electrons.

The amount of pressure that is required on the suction side of the pump to prevent cavitation.

In computing, two or more computers connected for the purposed of exchanging messages and sharing data and system resources.

Addition of an acid or alkali (base) to a liquid to cause the ph of the liquid to move towards a neutral pH of 7.0.

A subatomic particle that has a mass almost equal to the proton but with no electronic charge, located in the nucleus of the atom.

National Fire Protection Association.

A terminal in a computer network.

Metal that does not contain iron.

A check valve that can be manually closed to prevent the back flow of steam from a header to a boiler.

Gas in a system that does not condense at the temperature and pressure at which it exists in the system.

In mechanics, perpendicular or at a right angle (90 degrees) to something. A normal stress is produced in a plane at 90 degrees to the force that is producing it.

A word that names a person, place, object, event, idea, or activity.