Two objects are in thermal equilibrium with each other if they do not exchange energy when in thermal contact.
Temperature is the property that determines whether an object is in thermal equilibrium with other objects. Two objects in thermal equilibrium with each other are at the same temperature. The SI unit of absolute temperature is the kelvin, which is defined to be 1/273.16 of the difference between absolute zero and the temperature of the triple point of water.
One mole of any substance is that amount of the substance that contains Avogadro’s number of constituent particles (atoms or molecules).