ΔS

In equations, the function:

 \Delta S \,

where Delta, symbol "Δ", means "large change" (as contrasted with "differential change", symbol "d"), as in before minus after of some quantity, and S is entropy of the system, whereby the product or joint symbol ΔS is the entropy change of the system or reaction on going from an initial state entropy to a final state entropy or in expanded form:

 \Delta S = S_f - S_i \,

See also
TΔS
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