An erg is the amount of work done by a force of one dyne exerted for a distance of one centimetre. In the CGS base units, it is equal to one gram centimetre-squared per second-squared (g⋅cm2/s2).

Application of the human factor in the analysis and design of equipment and working environment. The aim is to improve efficiency and the health and comfort of those working.

The destruction of metals or other material by the abrasive action of moving fluids, usually accelerated by the presence of solid particles or matter in suspension. See also cavitation erosion.

The physical removal of material from a surface by mechanical means such as e.g. flowing liquid. It may be accelerated by corrosion.

The difference between an actual and the ideal or desired value or condition.

A clearly marked way in the vessel which has to be followed in case of emergency.

A vertical trunk fitted with a ladder to permit personnel to escape after being trapped.

Attending a vessel, to be available in case of need, e.g. icebreaker, tug, etc.

All equipment necessary to ensure propulsion and steerability of the ship, safety of passengers and crew, cargo, ship and machinery. Essential equipment is subdivided into the primary and the secondary ones.

The electricity supply to services required for navigation, propulsion and the safety of life.

Etendue is a property of light in an optical system, which characterizes how "spread out" the light is in area and angle.

Ethanol fuel is ethyl alcohol, the same type of alcohol found in alcoholic beverages, used as fuel.

Used in the photovoltaics industry as an encapsulation material for crystalline silicon solar cells in the manufacture of photovoltaic modules.

An energy exchange which develops, operates and connects secure, liquid and transparent markets for energy and commodity products around the globe which includes contracts for energy trading.

A set of policy initiatives by the European Commission with the overarching aim of making Europe climate neutral in 2050.

ENTSO-E represents 42 electricity transmission system operators (TSOs) from 35 countries across Europe, thus extending beyond EU borders.

EU Directive established an energy consumption labelling scheme.

A eutectic system is a homogeneous mixture of substances that melts or solidifies at a single temperature that is lower than the melting point of any of the constituents.

Evacuated flat plate collectors surround a large area metal sheet absorber with high vacuum inside a flat envelope made of glass and metal.

Evacuated tube collectors make use of a glass tube to surround the absorber with high vacuum and effectively resist atmospheric pressure.