A steam turbine is a device that extracts thermal energy from pressurized steam and uses it to do mechanical work on a rotating output shaft.

A steam trap is a device used to discharge condensates and non-condensable gases with a negligible consumption or loss of live steam.

Steam reforming or steam methane reforming is a method for producing syngas (hydrogen and carbon monoxide) by reaction of hydrocarbons with water.

An explosion caused by violent boiling or flashing of water or ice into steam, occurring when water or ice is either superheated, rapidly heated by fine hot debris produced within it, or heated by the interaction of molten metals (as in a fuel–coolant interaction of molten nuclear-reactor fuel rods with water in a nuclear reactor core following a core-meltdown).

A Steam engine is an external combustion engine that derives motion from the thermal expansion or condensation of steam.

Steam is water in the gas phase.

In systems theory, a system or a process is in a steady state if the variables (called state variables) which define the behavior of the system or the process are unchanging in time.

The stationary part of an electric motor.

A static VAR compensator is a set of electrical devices for providing fast-acting reactive power on high-voltage electricity transmission networks.

A static synchronous series compensator (SSSC) is a type of flexible AC transmission system which consists of a solid-state voltage source inverter coupled with a transformer that is connected in series with a transmission line.

A static synchronous compensator (STATCOM), is a regulating device used on alternating current electricity transmission networks.

A power inverter that do not use moving parts in the conversion process.

Static friction ("stiction") is the friction between non-moving surfaces.

Static electricity is an imbalance of electric charges within or on the surface of a material.

Static cling is the tendency for light objects to stick (cling) to other objects owing to static electricity.

A state variable is one of the set of variables that are used to describe the mathematical "state" of a dynamical system.

In physics, a state of matter is one of the distinct forms in which matter can exist.

A figure of merit of the condition of a battery (or a cell, or a battery pack), compared to its ideal conditions.

State of charge is the level of charge of an electric battery relative to its capacity.

A state function is a function defined for a system relating several state variables or state quantities that depends only on the current equilibrium thermodynamic state of the system not the path which the system took to reach its present state.