steam engine – a heat engine that performs mechanical work using steam as its working fluid. Steam engines are external combustion engines, where the working fluid is separate from the combustion products. Non-combustion heat sources such as solar power, nuclear power or geothermal energy may be used.
The steam engine, 1712 – Powered the factories, trains, and ships that drove the Industrial Revolution
- steam turbine, 1884 – A less heralded cousin of steam engines, turbines are the backbone of today’s energy infrastructure: they generate 80 percent of the world’s power.