A device that reduces the pressure of liquid refrigerant entering the evaporator and meters and regulates the flow of refrigerant so that it can properly absorb heat.

An experiment is a procedure carried out to support or refute a hypothesis.

Exploration geophysics is an applied branch of geophysics and economic geology, which uses physical methods, such as seismic, gravitational, magnetic, electrical and electromagnetic at the surface of the Earth to measure the physical properties of the subsurface, along with the anomalies in those properties.

A relief valve fitted to the engine crankcase doors as a safeguard against explosions. It relieves excess pressure, stop flames being emitted and prevent from the entry of air into the crankcase.

Electrical equipment is defined and certified as explosion-proof when it is enclosed in a case, which is capable of withstanding within it the explosion of a hydrocarbon gas/air mixture, or other specified flammable gas mixture

A dust explosion is the rapid combustion of fine particles suspended in the air within an enclosed location.

A vapour-air or gas-air mixture that is capable of being ignited by a source that is at or above the ignition temperature of the vapour-air or gas-air mixture.

The costs indirectly borne by society as a whole as a consequence of using that energy source.

Hydraulic cylinders mounted outside the hatch covers used for opening and closing them.

The extraction of petroleum is the process by which usable petroleum is drawn out from beneath the earth's surface location.

Extra-low voltage is an electricity supply voltage in a range which carries a low risk of dangerous electrical shock.