Discussion
According to the second law of thermodynamics, in any energy transfer or transformation, the total entropy of a closed system always :
Answer: A
The total entropy always increases.
The second law of thermodynamics states that in any spontaneous energy transfer or transformation the entropy of an isolated system increases; some energy is always degraded to low-grade heat. In ecology this is why energy cannot be recycled through a food chain and why only a fraction passes from one trophic level to the next.
Strictly, entropy stays constant only in an ideal reversible process, so it never decreases. It does not reach zero, which happens only for a perfect crystal at absolute zero (the third law). 'Negative' is not a possible value of absolute entropy.
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