A stress–strain curve for a material gives the relationship between stress and strain.

Stress corrosion cracking is the growth of crack formation in a corrosive environment.

Stress is a physical quantity that expresses the internal forces that neighbouring particles of a continuous material exert on each other

A street light, light pole, lamppost, street lamp, light standard or lamp standard is a raised source of light on the edge of a road or path.

In geology and related fields, a stratum (plural: strata) is a layer of sedimentary rock or soil, or igneous rock that was formed at the Earth's surface, with internally consistent characteristics that distinguish it from other layers.

Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification).

In a stratigraphic trap, the geometry allowing the accumulation of hydrocarbons is of sedimentary origin and has not undergone any tectonic deformation.

A stranded gas reserve is a natural gas field that has been discovered, but remains unusable for either physical or economic reasons.

Stranded assets are assets that have suffered from unanticipated or premature write-downs, devaluations or conversion to liabilities.

An insulator designed to withstand the strain imparted by suspended power lines.

Strain is a measure of deformation representing the displacement between particles in the body relative to a reference length.

The straight or inline engine is an internal combustion engine with all cylinders aligned in one row and having no offset.

Storage tanks are containers that hold liquids, compressed gases or mediums used for the short- or long-term storage of heat or cold.

A storage heater or heat bank is a domestic electrical heater which stores thermal energy during the evening, or at night when electricity is available at lower cost, and releases the heat during the day as required.

A mechanical device attached to transmission lines that aid in the reduction of vibrations.

A heat engine comprising two cylinders, the hot cylinder whereby gases expand and a cold cylinder to cool and regenerate the gas in a closed loop system.

Transformers that either increase (step-up) or reduce (step-down) the input voltage to produce the desired output voltage. This is achieved by varying the primary and secondary windings.

A support structure for offshore wind turbines the similar to those used in the oil and gas industry, in water 20–80 metres (70–260 ft) deep

The is a power station in which the electric generator is steam driven.

Steam turbine governing is the procedure of controlling the flow rate of steam to a steam turbine so as to maintain its speed of rotation as constant.