Thermodynamic Entropy Calculator

Calculate entropy changes for various thermodynamic processes and systems.

Process Type

Amount of Substance (mol)

Initial Temperature T₁ (K)

Final Temperature T₂ (K)

Initial Volume V₁ (m³)

Final Volume V₂ (m³)

ΔS (monatomic gas): 14.4071 J/K

ΔS (diatomic gas): 20.1699 J/K

General: dS = δQ_rev / T

Ideal gas: ΔS = nCv ln(T₂/T₁) + nR ln(V₂/V₁)

Isothermal: ΔS = nR ln(V₂/V₁)

Isobaric: ΔS = nCp ln(T₂/T₁)

Isochoric: ΔS = nCv ln(T₂/T₁)

Boltzmann: S = kB ln(Ω)

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MyCalcBuddy Editorial Team

This page is maintained as an educational calculator reference.

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Formula Source: University Physics

by Young & Freedman

ðŸ”„Last reviewed: May 2026

âœ“Formula checks are based on standard references and internal QA review.