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The second (symbol: s) (abbreviated s or sec) is the base unit of time in the International System of Units (SI).
delta-S = Q/T In any reversible thermodynamic process, it can be represented in calculus as the integral from a processes initial state to final state of dQ / T. One way of stating the second law of thermodynamics is: In any closed system, the entropy of the system will either remain constant or increase. One way to view this is that adding heat to a system causes the molecules and atoms to speed up.