Diathermal wall

In thermodynamics, a diathermal wall between two thermodynamic systems allows heat but not matter to pass across it.

The diathermal wall is important because, in thermodynamics, it is customary to assume a priori, for a closed system, the physical existence of transfer of energy across a wall that is impermeable to matter but is not adiabatic, transfer which is called transfer of energy as heat, though it is not customary to label this assumption separately as an axiom or numbered law.

单词	Diathermal wall
释义	Diathermal wall 英语百科 Diathermal wall In thermodynamics, a diathermal wall between two thermodynamic systems allows heat but not matter to pass across it. The diathermal wall is important because, in thermodynamics, it is customary to assume a priori, for a closed system, the physical existence of transfer of energy across a wall that is impermeable to matter but is not adiabatic, transfer which is called transfer of energy as heat, though it is not customary to label this assumption separately as an axiom or numbered law.
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