WAir preheater
WBimetallic strip
WDalton's law
WDühring's rule
WEquation of state
WExpander cycle
WJet engine
WLjungström air preheater
WNon-random two-liquid model
WPhase (matter)
WPiston-cylinder apparatus
WRecuperator
WState of matter
WTheorem of corresponding states
WThermal efficiency
WVan der Waals equation
WVapor pressure
WVolatility (chemistry)