Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to a given mass of a material to produce a unit change in its temperature.

Specific kinetic energy is kinetic energy of an object per unit of mass.

In thermodynamics, the specific volume of a substance is an intrinsic property of a substance, defined as the ratio of the substance's volume (V) to its mass (m).

The specific weight, also known as the unit weight, is the weight per unit volume of a material.

Technical Specification is, beside the Contract, the most important contractual document that shall describe exactly characteristics of the new vessel.

The wind speed, ambient temperature, seawater temperatures, current and wave height under which the vessel is designed to carry out intended operations.

The speed of an object is the magnitude of the change of its position.

Ship speed measuring devices.

Test runs which are carried out by a newly completed ship to determine its speed, the engine revolutions per minute and the power developed.

Spent fuel pools are storage pools for spent fuel from nuclear reactors.

Spent nuclear fuel, occasionally called used nuclear fuel, is nuclear fuel that has been irradiated in a nuclear reactor (usually at a nuclear power plant).

Special equipment for fighting accidental oil spills at early stages.

A spillway is a structure used to provide the controlled release of water from a dam or levee downstream, typically into the riverbed of the dammed river itself.

A part of a machine which rotates, e.g. lathe spindle, or a pin upon which another part turns.

The spinning reserve is the extra generating capacity that is available by increasing the power output of generators that are already connected to the power system.

An enclosure which protects electrical equipment from drops of liquid or solid particles which fall onto it or travel along a straight line at any angle not greater than 100 degrees from the vertical.

The chemical overall used as a protection suit when a gastight clothing is unnecessary. It provides effective protection against chemicals, oils, etc.

An apparatus used for fire-fighting purposes.

The term for a cross-joint at which the panels separate, i.e. they are not hinged together.

Projections (buoyancy casings) from each side of the hull used sometimes on ro-ro ferries to enhance their stability.