Diathermal wall
= Diathermal wall
A diathermal wall permits <heat transfer>. For a clean <zeroth law of thermodynamics> comparison, idealize it as rigid and impermeable, excluding boundary <work> and matter transfer. A thin metal partition approximates this arrangement.<Statistical Physics by David Tong/4 Classical Thermodynamics>[§4.1, printed p. 109: rigid, particle-impermeable diathermal walls and the thin-metal example]{ref}