A guarantee of a level of supplied power committed to by a supplier to be available at all times during a period covered by a commitment.

Firedamp is flammable gas found in coal mines.

In a steam engine, the firebox is the area where the fuel is burned, producing heat to boil the water in the boiler.

Combine heat and power plant. In CHP plants the excess heat from engine cooling and exhaust gases are harnessed for district heating needs.

The width of a wind turbine blade at a given location along the length.

Chlorofluorocarbons (CFC’s) and hydrochlorofluorocarbons (HCFC’s) are fully or partly halogenated paraffin hydrocarbons that contain only carbon (C), hydrogen (H), chlorine (Cl), and fluorine (F), produced as volatile derivative of methane, ethane, and propane.

A chiller is a machine that removes heat from a liquid via a vapor-compression, adsorption refrigeration, or absorption refrigeration cycles.

Cherenkov radiation is electromagnetic radiation emitted when a charged particle (such as an electron) passes through a dielectric medium at a speed greater than the phase velocity (speed of propagation of a wave in a medium) of light in that medium.

Chemical thermodynamics is the study of the interrelation of heat and work with chemical reactions or with physical changes of state within the confines of the laws of thermodynamics.

A chemical plant is an industrial process plant that manufactures (or otherwise processes) chemicals, usually on a large scale.

Chemical energy is the potential of a chemical substance to undergo a chemical reaction to transform into other substances.

An element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei, chemical elements cannot be broken down into simpler substances by chemical means.

In chemistry, the term "contamination" usually describes a single constituent, but in specialized fields the term can also mean chemical mixtures, even up to the level of cellular materials.

A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.

A chart recorder is an electromechanical device that records an electrical or mechanical input trend onto a piece of paper (the chart).

Charles's law (also known as the law of volumes) is an experimental gas law that describes how gases tend to expand when heated.

Charcoal is a lightweight black carbon residue produced by strongly heating wood (or other animal and plant materials) in minimal oxygen to remove all water and volatile constituents.

The process of charging a rechargeable battery and discharging it as required into a load.

Char is the solid material that remains after light gases (e.g. coal gas) and tar have been driven out or released from a carbonaceous material during the initial stage of combustion, which is known as carbonization, charring, devolatilization or pyrolysis.

Change control within quality management systems (QMS) is a process used to ensure that changes to a product or system are introduced in a controlled and coordinated manner.