Difference between Enthalpy and Entropy

We know that the major difference between enthalpy and entropy is that even though they are part of a thermodynamic system, enthalpy is represented as the total heat content whereas entropy is the degree of disorder.

Difference Between Enthalpy and Entropy

In a closed system,

\(\begin{array}{l}T.\Delta S=\Delta H\end{array} \)
which means that in an absolute temperature with some change in entropy results in a change of enthalpy.

Difference between Enthalpy and Entropy

Enthalpy is the measure of total heat present in the thermodynamic system where the pressure is constant.

It is represented as

\(\begin{array}{l}\Delta H=\Delta E+P\Delta V\end{array} \)
where E is the internal energy, P is the pressure and E is the energy.

Entropy is the measure of disorder in a thermodynamic system. It is represented as

\(\begin{array}{l}\Delta S=\Delta Q/T\end{array} \)
where Q is the heat content and T is the temperature.

Difference between Enthalpy and Entropy
Enthalpy Entropy
Enthalpy is a kind of energy. Entropy is a property.
It is the sum of the internal energy and the flow of energy It is the measurement of the randomness of molecules.
It is denoted by the symbol H It is denoted by the symbol S
It was termed by a scientist named Heike Kamerlingh Onnes. It was termed by a scientist named Rudolf Clausius.
Its unit is Jmol-1 Its unit is JK-1
It is applicable to related standard conditions. It does not have any limits or conditions.
The system favours minimum enthalpy<./td> The system favours maximum entropy.

These were some difference between Enthalpy and Entropy. If you wish to find out more, download BYJU’S The Learning App.

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Entropy & Second Law of Thermodynamics Thermodynamics

Frequently Asked Questions – FAQs

Q1

What is entropy?

Entropy is the measure of disorder in a thermodynamic system.
Q2

What is enthalpy?

Enthalpy is the measure of total heat present in the thermodynamic system where the pressure is constant.
Test your knowledge on Enthalpy and entropy differences

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