Thermal equilibrium is a state in which two or more objects in contact have the same temperature such that the rate of heat flow between them are constant.
When a hot sample is in contact with a cold sample, the cold sample absorbs heat from the hot one. Such that the temperature of the hot sample deceases with time, while that of the cold sample increases. Assuming there is no heat loss to the surroundings, a time will be reached where the two samples have the same temperature. Thus, both samples have reached a thermal equilibrium point.
This is a state in which heat energy flows between the two samples at the same rate without any increase or decrease in their temperature. Therefore the temperature of the two samples are constant.
The required diagram is attached to this answer.
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