Entropy Change Associated with Work

In summary, entropy change associated with work is a measure of energy transfer between a system and its surroundings during a physical or chemical process. It can be calculated using ΔS = q/T and is closely linked to the degree of disorder or randomness in a system. As work is done, the entropy either increases or decreases depending on the direction of energy transfer, and this has significant implications for the spontaneity and efficiency of thermodynamic processes. While entropy change associated with work can be negative, the overall change in entropy for the system and its surroundings must always be positive, in accordance with the second law of thermodynamics.
  • #1
Ali Asadullah
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Why entropy change associated with work is zero?
 
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  • #2
You sure that's correct?
 
  • #3
Reversible work, at least. I've seen an interpretation of this in McQuarrie's Statistical Mechanics. He describes reversible work as a raising or lowering of the energy of all the microstates, but not a change in the number of microstates. Thus, the system entropy is unchanged. During heating, however, the number of microstates changes, and so does the system entropy.
 

What is entropy change associated with work?

Entropy change associated with work is a measure of the amount of energy that is transferred between a system and its surroundings during a physical or chemical process. It describes the change in the degree of disorder or randomness of a system as it performs work.

How is entropy change associated with work calculated?

The entropy change associated with work can be calculated using the equation ΔS = q/T, where ΔS is the change in entropy, q is the heat transferred, and T is the temperature in Kelvin.

What is the relationship between work and entropy change?

The relationship between work and entropy change is that work is one way in which energy can be transferred between a system and its surroundings, and this transfer of energy results in a change in entropy. As work is done on a system, the degree of disorder or randomness of the system decreases, leading to a decrease in entropy. Conversely, when work is done by a system, the degree of disorder or randomness increases, resulting in an increase in entropy.

How does entropy change associated with work affect thermodynamic processes?

Entropy change associated with work is a fundamental concept in thermodynamics and plays a key role in determining the direction and efficiency of thermodynamic processes. It helps to explain why certain processes are spontaneous, while others are not. In general, processes that result in a decrease in entropy are non-spontaneous, while processes that result in an increase in entropy are spontaneous.

Can entropy change associated with work be negative?

Yes, entropy change associated with work can be negative. This occurs when work is done on a system, causing a decrease in entropy. However, it is important to note that this decrease in entropy is only temporary and is always accompanied by an increase in entropy elsewhere, such as in the surroundings. The overall change in entropy for the entire system must always be positive, in accordance with the second law of thermodynamics.

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