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When Î´S is negative and Î´H is negative, the relative magnitudes of Î´S and Î´H determine if the reaction is spontaneous. Low temperatures make the reaction more favorable. When Î´S is negative and Î´H is positive, a process is not spontaneous at any temperature, but the reverse process is spontaneous.A spontaneous process is the time-evolution of a system in which it releases free energy (usually as heat) and moves to a lower, more thermodynamically stable energy state.hen Î´ S is positive and Î´ H is negative, a process is always spontaneous. When Î´ S is positive and Î´ H is positive, the relative magnitudes of Î´ S and Î´ H determine if the reaction is spontaneous. High temperatures make the reaction more favorable.
Spontaneous potential. Spontaneous potential (SP), also called self potential, is a naturally occurring electric potential difference in the Earth, measured by an electrode relative to a fixed reference electrode. Spontaneous potentials are often measured down boreholes for formation evaluation in the oil and gas industry, and they can also be measured along the Earth's surface for mineral exploration or groundwater investigation.