Change in Entropy
Change in Entropy is a state function, meaning that it depends only on the initial and final states of the system and not on the path taken to get there.
Entropy Change during Reversible Adiabatic Expansion
Reversible Adiabatic Expansion is a process in which no heat flows in or out of the system, and the process is reversible. In this case, the change in entropy is given as
dS = dQ/T = 0
Now, let’s consider a system undergoing a reversible adiabatic expansion. Since no heat flows in or out of the system, the entropy change (ΔS) is zero.
- This is because the process is reversible, and the system returns to its original state after the expansion.
- In this case, there is no net change in the disorder or randomness of the system; thus, the entropy change is zero.
Entropy
Entropy means the amount of disorder or randomness of a system. It is a measure of thermal energy per unit of the system which is unavailable for doing work. The concept of entropy can be applied in various contexts and stages, including cosmology, economics, and thermodynamics. Entropy is a concept that essentially discusses the spontaneous changes that take place in ordinary phenomena or the Universe’s inclination towards disorder.
In this article, we will learn what is meaning of Entropy, the entropy change formula, and how it is associated with the laws of thermodynamics.
Table of Content
- What is Entropy?
- Properties of Entropy
- Entropy Formula
- Change in Entropy
- Entropy Changes During Phase Transition
- Entropy and Enthalpy