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http://www.lnk2lrn.com/apb_physicsch14_15.html
A heat engine continuously converts thermal energy to mechanical energy and does work. The efficiency, e, of a heat engine is expressed by the

equation e = (Work done)/(Input heat) = W/QH.

http://www.profbunsen.com.au/proddetail.php?prod=H13M
When air is heated it expands and when it is cooled it contracts. This principle makes the cyclical motion of a Stirling engine possible. It is a simple, environmentally friendly heat engine, continuously converting thermal energy (heat) from an external source into mechanical energy.

http://www.physics.rutgers.edu/ugrad/351/Lecture%2010.ppt
any continuously operating reversible device generating work from “heat”

A heat engine is a device used to continuously convert thermal energy to mechanicalenergy

ISBN
pl:OPAC Biblioteki Narodowej w Warszawie: II 933.983

sygnatura pl:OPAC II 933.983