Steam

gaseous gaseous state of waterPCrunning body of water
Steam is water vapor, which is water in the gas phase.wikipedia
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Water

H 2 OHOliquid water
Steam is water vapor, which is water in the gas phase.
The gaseous state of water is steam or water vapor.

Water vapor

water vapourvaporevaporation
Steam is water vapor, which is water in the gas phase.
Use of water vapor, as steam, has been important to humans for cooking and as a major component in energy production and transport systems since the industrial revolution.

Aerosol

aerosolsaerodynamic diameteratomization
Steam is invisible; however, "steam" often refers to wet steam, the visible mist or aerosol of water droplets formed as this water vapour condenses.
Examples of natural aerosols are fog, dust, forest exudates and geyser steam.

Superheated steam

saturated steamsuperheatedsaturated
If heated further it becomes superheated steam.
Superheated steam is a steam at a temperature higher than its vaporization (boiling) point at the absolute pressure where the temperature is measured.

Steam engine

steam powertriple expansion enginetriple expansion
The enthalpy of vaporization is the energy required to turn water into the gaseous form when it increases in volume by 1,700 times at standard temperature and pressure; this change in volume can be converted into mechanical work by steam engines such as reciprocating piston type engines and steam turbines, which are a sub-group of steam engines.
A steam engine is a heat engine that performs mechanical work using steam as its working fluid.

Steam explosion

explosive boilingexplosivelyexploded
If liquid water comes in contact with a very hot surface or depressurizes quickly below its vapor pressure, it can create a steam explosion.
A steam explosion is an explosion caused by violent boiling or flashing of water into steam, occurring when water 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, or FCI, of molten nuclear-reactor fuel rods with water in a nuclear reactor core following a core-meltdown).

District heating

district heatsteamdistrict energy
However, in cogeneration, steam is piped into buildings through a district heating system to provide heat energy after its use in the electric generation cycle.
The U.S. Naval Academy in Annapolis began steam district heating service in 1853.

Soil steam sterilization

soil steamingsoil sterilizationSoil Sterilizer
In agriculture, steam is used for soil sterilization to avoid the use of harmful chemical agents and increase soil health.
Soil steam sterilization (soil steaming) is a farming technique that sterilizes soil with steam in open fields or greenhouses.

New York City steam system

New York Steam Companysteam systemCon Edison operates
The world's biggest steam generation system is the New York City steam system, which pumps steam into 100,000 buildings in Manhattan from seven cogeneration plants.
Con Edison’s Steam Operations are a district heating system which takes steam produced by steam generating stations and carries it under the streets of Manhattan to heat and cool buildings and businesses in Manhattan.

Steam turbine

steam turbinesgeared turbinesturbines
The enthalpy of vaporization is the energy required to turn water into the gaseous form when it increases in volume by 1,700 times at standard temperature and pressure; this change in volume can be converted into mechanical work by steam engines such as reciprocating piston type engines and steam turbines, which are a sub-group of steam engines. As of 2000 around 90% of all electricity was generated using steam as the working fluid, nearly all by steam turbines.
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.

Phase diagram

phase diagramsbinary phase diagramphase
Additionally, thermodynamic phase diagrams for water/steam, such as a temperature-entropy diagram or a Mollier diagram shown in this article, may be useful.
For example, single-component graphs of temperature vs. specific entropy (T vs. s) for water/steam or for a refrigerant are commonly used to illustrate thermodynamic cycles such as a Carnot cycle, Rankine cycle, or vapor-compression refrigeration cycle.

Cogeneration

combined heat and powerCHPco-generation
However, in cogeneration, steam is piped into buildings through a district heating system to provide heat energy after its use in the electric generation cycle.
A heat recovery steam generator (HRSG) is a steam boiler that uses hot exhaust gases from the gas turbines or reciprocating engines in a CHP plant to heat up water and generate steam.

Electricity

electricalelectricelectrically
Piston type steam engines played a central role to the Industrial Revolution and modern steam turbines are used to generate more than 80% of the world's electricity.
Electrical power is usually generated by electro-mechanical generators driven by steam produced from fossil fuel combustion, or the heat released from nuclear reactions; or from other sources such as kinetic energy extracted from wind or flowing water.

Lifting gas

lighter-than-airlighter than airaerostatically
Owing to its low molecular mass, steam is an effective lifting gas, providing approximately 60% as much lift as helium and twice as much as hot air.
The gaseous state of water is lighter than air (density 0.804 g/L at STP, average molecular mass 18.015 g/mol) due to water's low molar mass when compared with typical atmospheric gases such as nitrogen gas.

Food steamer

steamerSteamersPottery steamer
A food steamer or steam cooker is a small kitchen appliance used to cook or prepare various foods with steam heat by means of holding the food in a closed vessel reducing steam escape.

Sterilization (microbiology)

sterilizationsterilesterilized
An autoclave, which uses steam under pressure, is used in microbiology laboratories and similar environments for sterilization.
Most medical and surgical devices used in healthcare facilities are made of materials that are able to go under steam sterilization.

Live steam

steam fairmodel or scale-steam-locomotiverallies
Live steam is steam under pressure, obtained by heating water in a boiler.

Industrial Revolution

industrialindustrialismindustrial era
Piston type steam engines played a central role to the Industrial Revolution and modern steam turbines are used to generate more than 80% of the world's electricity.

Geyser

geyserscold-water geysercryogeyser
With this release of pressure, the superheated water flashes into steam, boiling violently throughout the column.

Working fluid

working fluidscooling fluidproperties of the actual working fluid
As of 2000 around 90% of all electricity was generated using steam as the working fluid, nearly all by steam turbines.

Steaming

steamedsteamsteam cook
Steaming is a method of cooking using steam.

Autoclave

autoclavingAutoclavesautoclavable
An autoclave, which uses steam under pressure, is used in microbiology laboratories and similar environments for sterilization.
A medical autoclave is a device that uses steam to sterilize equipment and other objects.

IAPWS

International Association for the Properties of Steam and WaterInternational Association for the Properties of Water and Steam
The International Association for the Properties of Water and Steam (IAPWS) is an international non-profit association of national organizations concerned with the properties of water and steam, particularly thermophysical properties and other aspects of high-temperature steam, water and aqueous mixtures that are relevant to thermal power cycles and other industrial applications.

Rankine cycle

Rankinesteam cycleRankine engine
Engineers use an idealised thermodynamic cycle, the Rankine cycle, to model the behavior of steam engines.
The regenerative Rankine cycle is so named because after emerging from the condenser (possibly as a subcooled liquid) the working fluid is heated by steam tapped from the hot portion of the cycle.

Gas

gasesgaseousgaseous state
Steam is water vapor, which is water in the gas phase.