Compute ΔS = Q_rev / T for reversible heat transfer.
Entropy Change (ΔS)
3.3540 J/K
0.003354 kJ/K
Formula: ΔS = Q_rev / T
Entropy measures the dispersal of energy in a system; for a reversible transfer at constant temperature, ΔS = Q_rev / T. It is a state function and central to the second law of thermodynamics.
This calculator provides a simple reversible-process estimate. For temperature-dependent or irreversible processes, more advanced thermodynamic analysis is required.
For a reversible heat transfer, ΔS = Q_rev / T where T is absolute temperature in kelvin.
This tool shows ΔS in J/K and kJ/K.
Absolute temperature in kelvin must be positive; division by zero or negative temperatures are invalid for this formula.
No — formula applies to reversible transfers; irreversible processes require path-dependent analysis.
To get molar ΔS, divide ΔS by number of moles involved.
For phase changes, use latent heat at the transition temperature; integrate when temperature varies.
This is a math tool — verify thermodynamic assumptions before using for design.
kJ/K provides a compact, human-friendly scale for large energy transfers.
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