Formula
This calculator uses the equation below. Use it as a quick reference when checking setup before solving.
ΔS = n R ln(V_2 / V_1)Physical Chemistry
Entropy Change (isothermal ideal gas expansion) Calculator
Compute Entropy Change (isothermal ideal gas expansion) using ΔS = n R ln(V_2 / V_1).
ΔS = n R ln(V_2 / V_1)
Run this calculator
Leave a nullable field blank to solve for it.
Variable glossary
N (n)
Input variable 'n' for Entropy Change (isothermal ideal gas expansion). Set one variable to null to solve for it.
R (R)
Input variable 'R' for Entropy Change (isothermal ideal gas expansion). Set one variable to null to solve for it.
V 2 (v_2)
Input variable 'v_2' for Entropy Change (isothermal ideal gas expansion). Set one variable to null to solve for it.
V 1 (v_1)
Input variable 'v_1' for Entropy Change (isothermal ideal gas expansion). Set one variable to null to solve for it.
Deltas (deltaS)
Result variable 'deltaS' for Entropy Change (isothermal ideal gas expansion). Set to null (or omit) to compute this value.
Worked example
Try these sample values to validate the setup, then replace inputs with your own conditions.
- n: 2
- R: 3
- v_2: 4
- v_1: 5
Frequently Asked Questions
What does the Entropy Change (isothermal ideal gas expansion) calculator solve?
It solves Entropy Change (isothermal ideal gas expansion) problems in physical chemistry using your provided inputs and computes unknown values when nullable fields are left blank.
Do I need to convert units before using this tool?
Use the unit toggles where available (for example K/C and L/mL). ChemGenius converts values to the calculator's base units automatically before solving.
Can I save this result in my workflow?
Yes. After computing a result, you can continue into ChemGenius workflows like protocol drafting or notes to keep your calculation context attached to downstream work.