If I heat some cold liquid water to To, do I increase its availability?
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If I heat some cold liquid water to To, do I increase its availability?
If I heat some cold liquid water to To, do I increase its availability?
No. You decrease its availability by bringing it closer to To, where it has zero availability, if we neglect pressure effects. Any substance at a T different from ambient (higher or lower) has a positive availability since you can run a heat engine using the two temperatures as the hot and cold reservoir, respectively. For a T lower than the ambient it means that the ambient is the hot side of the heat engine.