Editing Heat engine (section)

=== Phase-change cycles ===
In [[phase transition|phase change]] cycles and engines, the [[working fluid]]s are gases and liquids. The engine converts the working fluid from a gas to a liquid, from liquid to gas, or both, generating work from the fluid expansion or compression.
*[[Rankine cycle]] (classical [[steam engine]])
*[[Regenerative cycle]] ([[steam engine]] more efficient than [[Rankine cycle]])
*[[Organic Rankine cycle]] (Coolant changing phase in temperature ranges of ice and hot liquid water)
*Vapor to liquid cycle ([[drinking bird]], [[injector]], [[Minto wheel]])
*Liquid to solid cycle ([[frost heaving]] – water changing from ice to liquid and back again can lift rock up to 60&nbsp;cm.)
*Solid to gas cycle ([[firearm]]s  – solid propellants combust to hot gases.)