Entropy is a fundamental concept in thermodynamics that describes the degree of disorder or randomness in a system.
Entropy
Entropy is a measure of the disorder or randomness in a system. It quantifies the number of possible ways a system can be arranged.
The change in entropy, $ \Delta S $, is defined as:
$\Delta S = \frac{\Delta Q_{\mathrm{rev}}}{T}$
where:
If 200 J of heat is added to a system at 400 K, the change in entropy is:
$$
\Delta S = \frac{200 \, \text{J}}{400 \, \text{K}} = 0.5 \, \text{J K}^{-1}
$$
For a reversible heat transfer at temperature $T$, adding heat increases the system entropy and removing heat decreases it.
The second law of thermodynamics introduces the concept of entropy to explain why certain processes occur spontaneously while others do not.
The second law of thermodynamics
The second law of thermodynamics states that in any natural process, the total entropy of an isolated system always increases or remains constant in ideal reversible processes.
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