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.
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.
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