# Entropy Calculator

The Entropy Calculator will calculate the:

1. Change in the entropy of a thermodynamic system in terms of heat exchanged and temperature of system
2. Change in the entropy of a system in terms of gas parameters and molar specific heats
 🖹 Normal View🗖 Full Page View Calculator Precision (Decimal Places)0123456789101112131415 Initial pressure of gas (P1) Pa Initial volume of gas (V1) m3 Initial temperature of gas (T1) K Final pressure of gas (P2) Pa Final volume of gas (V2) m3 Final temperature of gas (T2) K Heat exchanged during the process (ΔQ) J Ideal gas constant (R) J/mol∙K Molar specific heat at constant volume (CV) J/mol∙K Molar specific heat at constant pressure (CP) J/mol∙K

Note: Write the ΔQ value as negative when the system releases heat to its surroundings.

Entropy Calculator Results (detailed calculations and formula below)
The change in the entropy of a thermodynamic system in terms of heat exchanged and temperature of system is:
• J/K for the hot object
• J/K for the cold object
• J/K in the universe
The change in the entropy of a thermodynamic system in terms of volume, temperature and molar specific heat at constant volume J/K
The change in the entropy of a thermodynamic system in terms of pressure, temperature and molar specific heat at constant pressure J/K
Change in entropy of system in terms of heat and temperature calculations

∆S1 = ∆Q/T1
∆S1 = /T1
∆S1 =

∆S2 = ∆Q/T2
∆S2 = /
∆S2 =

### Universe calculation

∆Suniverse = ∆S1 + ∆S2
Change in entropy in terms of V, T and CV calculation
∆S = CV × lnT2/T1 + R × lnV2/V1
∆S = × ln/ + × ln/
∆S = × ln() + × ln()
∆S = × + ×
∆S =
Change in entropy in terms of P, T and CP calculation
∆S = CP × lnT2/T1 - R × lnP2/P1
∆S = × ln/ - × ln/
∆S = × ln() - × ln()
∆S = × - ×
∆S =
Entropy Calculator Input Values
Initial pressure of gas (P1) Pa
Initial volume of gas (V1) m3
Initial temperature of gas (T1) K
Final pressure of gas (P2) Pa
Final volume of gas (V2) m3
Final temperature of gas (T2) K
Heat exchanged during the process (ΔQ) J
Ideal gas constant (R) J/mol∙K
Molar specific heat at constant volume (CV) J/mol∙K
Molar specific heat at constant pressure (CP) J/mol∙K

Please note that the formula for each calculation along with detailed calculations are available below. As you enter the specific factors of each entropy calculation, the Entropy Calculator will automatically calculate the results and update the Physics formula elements with each element of the entropy calculation. You can then email or print this entropy calculation as required for later use.

We hope you found the Entropy Calculator useful with your Physics revision, if you did, we kindly request that you rate this Physics calculator and, if you have time, share to your favourite social network. This allows us to allocate future resource and keep these Physics calculators and educational material free for all to use across the globe. We believe everyone should have free access to Physics educational material, by sharing you help us reach all Physics students and those interested in Physics across the globe. ## Related Physics Sections with Tutorials

Section 13: Thermodynamics

Mathematics

## Change in entropy of system in terms of heat and temperature Formula and Calculation

∆S1 = ∆Q/T1

∆S2 = ∆Q/T2

### Universe Formula

∆Suniverse = ∆S1 + ∆S2 = ∆Q/T1 + ∆Q/T2

## Change in entropy in terms of V, T and CV Formula and Calculation

∆S = CV × lnT2/T1 + R × lnV2/V1

## Change in entropy in terms of P, T and CP Formula and Calculation

∆S = CP × lnT2/T1 - R × ln P2/P1

## Thermodynamics Physics Tutorials associated with the Entropy Calculator

The following Physics tutorials are provided within the Thermodynamics section of our Free Physics Tutorials. Each Thermodynamics tutorial includes detailed Thermodynamics formula and example of how to calculate and resolve specific Thermodynamics questions and problems. At the end of each Thermodynamics tutorial you will find Thermodynamics revision questions with a hidden answer that reveals when clicked. This allows you to learn about Thermodynamics and test your knowledge of Physics by answering the test questions on Thermodynamics.

## Physics Calculators

You may also find the following Physics calculators useful.