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Heat is transferred from a hotter body to a colder body because it is accompanied by entropy increase but, the converse never occurs because as such the entropy of the system is required to decrease. But, no one has ever observed spontaneous transfer of heat from a colder body to a hotter body.Įven though such phenomenon are permissible by the first law, such processes never occur naturally. Heat always flows from a hotter body to a colder one spontaneously. Natural systems always have a tendency to maximise their entropy.Īnd that's what the second law is all about.Ĭonsider for example, the transfer of heat from one body to another in contact due to the temperature difference. In other words, second law specifies the direction of evolution of a natural process. All irreversible (natural and spontaneous) processes are characterized by the fact that entropy always increases in such processes.Īnd the second law of thermodynamics logically means that entropy always tends to increase.Ī physical system shall always proceed to a state of maximum entropy.
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