For spontaneity when ∆H and ∆S have the same sign, you use the Gibbs equation, ∆G = ∆H – T∆S, and see the temperature's role. Both positive? Spontaneous only at high T. Both negative? Spontaneous only at low T. Honestly, in my garage, with the pump’s heat and the fan's entropy, nothing feels spontaneous unless I juggle the variables just right—much like balancing this month’s electricity bill against the onion yield.
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