The setting on fire of an explosive mixture, usually within an engine cylinder.

The period between the beginning of fuel injection into an engine cylinder and the begining of combustion.

In photometry, illuminance is the total luminous flux incident on a surface, per unit area.

The change in draught resulting from the addition or removal of the particular mass. In SI system it is called tonnes per centimetre immersion, TPC.

A protective suit that reduces the body heat-loss of a person wearing it in cold water, e.g. when rescuing someone from the sea.

see International Maritime Organization.

IMO Data Collection System “DCS” defines data that the IMO mandates shipowners collect and report each calendar year.

Conventions and other mandatory documents such as codes referred to in conventions.

The effect that a particular energy source has on the environment.

Electrical impedance is the measure of the opposition that a circuit presents to a current when a voltage is applied.

A rotating member of a turbine, blower, fan, pump, or water propulsor.

A controlled cathodic protection of the hull against corrosion. The system incorporates a rectifier which supplies an automaticallyregulated direct current to the permanent anodes.

Impulse turbines change the direction of flow of a high velocity fluid or gas jet.

In-situ leaching, also called in-situ recovery or solution mining, is a mining process used to recover minerals such as copper and uranium through boreholes drilled into a deposit, in situ.

The survey of hull plating undertaken in the water. The ship is provided with marks placed on the shell to show borders of tanks, cofferdam etc

An incandescent lamp or incandescent light globe is an electric light with a wire filament heated until it glows.

The inchworm motor is a device that uses piezoelectric actuators to move a shaft with nanometer precision.

An incident ray is a ray of light that strikes a surface.

Incineration is a waste treatment process that involves the combustion of organic substances contained in waste materials.

The experiment performed to determine the ship vertical center of gravity. It consists of shifting a series of known weights transversally across the deck when the ship is free to heel.