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sci.entropy-change Calculator
Calculates entropy change (ΔS) for reversible and irreversible processes using ΔS = q_rev/T and statistical mechanics. The second law states that total entropy of an isolated system cannot decrease — mixing two ideal gases is spontaneous because ΔS_mix > 0.
Inputs
Q
Reference formula or conversion factor shown for context.
T
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
N
Reference formula or conversion factor shown for context.
Cp
Reference formula or conversion factor shown for context.
Results
ΔS isothermal (J/K)
Reference formula or conversion factor shown for context.
ΔS heating from 298K (J/K)
The value at the specified point or condition.
Gibbs ΔG (J)
Reference formula or conversion factor shown for context.
spontaneous?
Sample size or count used in the calculation.
2nd law
Sample size or count used in the calculation.
ΔS = q/T
Reference formula or conversion factor shown for context.