Thermal Equibirium

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·         If no heat flows between then when they are connected by a path permeable to heat.
·         Zeroth Law of thermodynamics.

·         Temporally uniform.

·         System allows transfer of energy as heat but does not allow transfer of matter or transfer of energy as work.

·         Heat can flow in to or out of a closed system by away of thermal condition or of thermal radiation to or from a thermal reservoir. 

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