Thermodynamics is the study of energy and its relationship to other forms of energy in a system.  There are at least three laws of thermodynamics.  The first law states that the total amount of energy in a system remains constant.  The second law deals with heat flow, where heat cannot flow into a system that has a higher degree of heat unless it is acted upon by another force or system.  This law also deals with entropy, where there is an increase of useless energy in a system as heat distribution becomes even in a system, and no useable energy can be obtained.  In other words, things run down.  The third law states that a system cannot be reduced to absolute zero, the lowest possible temperature where atomic movement ceases.




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