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Recently Added Physical Formulas

· Heat Capacity
· Thermodynamics - Introduction
· Van der Waals' Equation
· Clausius–Clapeyron Relation
· Gibbs Free Energy

Additional Formulas

· Thermodynamics - Introduction
· First Law of Thermodynamics
· Ideal Gas Law
· Van der Waals' Equation
· Clausius–Clapeyron Relation
· Density
· Molar Mass
· Molar Volume
· Helmholtz Free Energy
· Internal Energy

Current Location > Physics Formulas > Thermodynamics > Entropy

Entropy

The entropy is defined as:

Where:
1, 2: stand for phase 1 and 2
T: temperature
d'Qrev: heat added to the system

For an ideal gas we have:

Where we have:
n: number of moles
c: heat capacities for constant volume and pressure
p: pressure

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