Question

what is thermal equilibrium

Answer 1

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THERMAL EQUILIBRIUM
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THE OBJECTS OF SAME TEMPERATURE DO NOT EXCHANGE ANY HEET EACH OTHER.THIS CONDITION OF NOT EXCHANGING HEET BETWEEN PHYSICAL OBJECTS WHEN THEY ARE IN CONTACT IS CALLED THERMAL EQUILIBRIUM.

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Answer 2

Two physical systems are in thermal equilibrium if no heat flows 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.

Systems in thermodynamic equilibrium are always in thermal equilibrium, but the converse is not always true. If the connection between the systems allows transfer of energy as heat but does not allow transfer of matter or transfer of energy as work, the two systems may reach thermal equilibrium without reaching thermodynamic equilibrium.