After objects of different temperature are mixed,the object of higher temperature will conduct the heat to the one of lower temperature.If there is no heat exchange between the objects and others,the mixture will finally reach a steady temperature.The heat released by the object of higher temperature will completely be absorbed by the one of lower temperature,which is called the heat balance principle.
Take picture2-1 for example,a piece of red-hot iron and a metal ball of normal temperature are placed in an insulated container.Then with the insulation board removed,mix the red-hot iron and the metal ball,and after a while,you will find the colour of the red-hot iron will fade away while the colour of the metal ball will become deeper.