thermodynamics entropy?

  • Thread starter Thread starter Guanqun G
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Guanqun G

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i was recently presented a thought experiment demonstrating the idea that the entropy of the universe must only increase.
An arbitrary system exchanging heat dQ with the surrounding

The entropy change of the system is given by

dS(sys) >/= dQ/T(sys) where T is the temperature

now what bothers me is the statement that the entropy of the surrounding is given by

dS(sur) = -dQ/T(sur)

why is the entropy change of the surroundings STRICTLY only equivilent to -dQ/T(sur)?

many thanks
 
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