Escape of liquids such as water, oil, etc., out of pipes, boilers, tanks, etc., or a minor inflow of seawater into the vessel due to a damage to the hull.

Engine operating with excess air in the fuel-air mixture, resulting in the presence of relatively high oxygen concentration in the exhaust stream.

A combustion process that increases the air to fuel ratio in order to reduce NOx in the exhaust.

Lean-burn gas engines is a spark-ignited lean-burn engine where the gas is mixed with air before the inlet valves.

An LED lamp or LED light bulb is an electric light that produces light using light-emitting diodes (LEDs). LED lamps are significantly more energy-efficient than equivalent incandescent lamps and can be significantly more efficient than most fluorescent lamps. The most efficient commercially available LED lamps have efficiencies of 200 lumens per watt (Lm/W).

Leeward is the direction downwind (or downward) from the point of reference.

A lemon battery is a simple battery often made for the purpose of education.

Length is a measure of distance.

Depending on the purpose different definitions of length L are used: 1. (L) – 96% of the total length on a waterline at 85% of the least moulded depth measured from the top of the keel...

The length of a vessel measured along the waterline from forward to aft.

The distance between the extreme points of a ship, forward and aft.

A levee is an elongated naturally occurring ridge or artificially constructed fill or wall that regulates water levels.

The UNITED GRACE is fitted with an automatic level gauging and tank monitoring system. The pressure sensors measure absolute pressures.

Level of measurement or scale of measure is a classification that describes the nature of information within the values assigned to variables.

Level sensors detect the level of liquids and other fluids and fluidized solids, including slurries, granular materials, and powders that exhibit an upper free surface.

The levelized cost of energy (LCOE), or levelized cost of electricity, is a measure of the average net present cost of electricity generation for a generating plant over its lifetime.

The levelized cost of storage (LCOS) is the analogous of LCOE applied to electricity storage technologies, such as batteries.

A lever is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum.

A motor-propelled survival craft carried by a ship for use in emergency. A ship should be its own best lifeboat but there are sometimes situations where abandonment of the ship is unavoidable.

Lifeboat davits are to be capable of turning out against an adverse heel of 20° and a trim of 10°, with the boat having been fully boarded in the stowed position...