Two physical systems are in thermal equilibrium if there are no net flow of thermal energy between them when they are connected by a path permeable to heat. Thermal equilibrium obeys the zeroth law of thermodynamics. A system is said to be in thermal equilibrium with itself if the temperature within the system is spatially and temporally uniform.\n\nAnswer this question: when are two bodies said to be in thermal equilibrium? Let's think fast. Stream of consciousness:
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To answer the above question, the relevant sentence is: Two physical systems are in thermal equilibrium if there are no net flow of thermal energy between them when they are connected by a path permeable to heat. So the final answer is if there are no net flow of thermal energy between them when they are connected by a path permeable to heat.
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