By definition, heat is the transfer of energy, which requires areas or objects with different energy values.
In other words, all energy may become heat energy in a universe going toward thermal equilibrium. Such death by heat means that the universe may eventually contain no free, usable energy for thermodynamic processes or work. Whether or not the temperature of the universe will reach absolute zero, or simply a lower overall temperature than the current range of temperatures, is unknown, but the idea of universal cooling remains constant. Little by little, all working processes and forms of energy are being irreversibly converted to a more disordered state in the form of heat, all thanks to this systematic tendency toward increased entropy. Thus, the outcome of energy distribution in a system involving work always favors heat there will always be more resultant heat energy than can be converted back into mechanical energy.
In terms of energy, heat energy is more disordered than the mechanical energy involved in performing the work that produces the heat. Systems always seek to be in a more disordered state, therefore the total entropy of the universe displays continual, positive growth. In short, the law states that the total entropy within a closed system must always increase to some irreversible extent. The main focus of the second law is entropy, or the measure of disorder in a physical system. In particular, the controversial prediction of universal Heat Death relies primarily on the second law of thermodynamics, which some experts believe will result in the eventual conversion of all life and matter - all of existence - into heat energy.
To construct those theories, experts tentatively apply the laws of physics to predict the behavior of objects and entities across the unimaginable expanses of space. There are many theories on how the universe could end, with none of the scenarios being particularly warm and fuzzy.
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