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At 0 K, fluids are assumed to have
Select one:
  • a)
    maximum entropy
  • b)
    minimum entropy
  • c)
    fixed value of entropy
  • d)
    zero entropy
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
At 0 K, fluids are assumed to haveSelect one:a)maximum entropyb)minimu...
Entropy is the measurement of Randomness of a System. Increase in thermal energy increases the randomness and hence Entropy. Now decreasing the temperature of a fluid results in decrease in it's thermal energy which decreases the randomness of the system which in turn decreases the entropy of the fluid. Now there is a finite randomness at normal temperature in the fluid and as we proceed from a higher temperature to a lower temperature the randomness decreases so does the entropy. After continuing this process when we reach 0K further no thermal energy can be extracted from the fluid and hence the system can be said to be completely ordered and as the system is ordered (i.e zero randomness) the entropy is assumed to be zero.
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At 0 K, fluids are assumed to haveSelect one:a)maximum entropyb)minimu...
Entropy is the measurement of Randomness of a System. Increase in thermal energy increases the randomness and hence Entropy. Now decreasing the temperature of a fluid results in decrease in it's thermal energy which decreases the randomness of the system which in turn decreases the entropy of the fluid. Now there is a finite randomness at normal temperature in the fluid and as we proceed from a higher temperature to a lower temperature the randomness decreases so does the entropy. After continuing this process when we reach 0K further no thermal energy can be extracted from the fluid and hence the system can be said to be completely ordered and as the system is ordered (i.e zero randomness) the entropy is assumed to be zero.
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At 0 K, fluids are assumed to haveSelect one:a)maximum entropyb)minimu...
Zero Entropy at 0 K

Entropy is a measure of the disorder or randomness in a system. It is a thermodynamic property that quantifies the distribution of energy among the microscopic states of a system. At absolute zero temperature, also known as 0 K or -273.15 °C, the entropy of a fluid is assumed to be zero. Let's explore why this is the case.

Entropy and Temperature

The entropy of a system is related to its temperature. As the temperature of a system increases, its entropy also increases. This can be understood by considering the number of possible microscopic states that the system can occupy at a given temperature. At higher temperatures, there are more available states for the system to occupy, leading to a higher entropy.

Zero Entropy at Absolute Zero

At absolute zero temperature, the system has reached its lowest possible energy state. All molecular motion ceases, and the system is in a perfectly ordered and organized state. This means that there is only one possible microscopic state that the system can occupy, resulting in zero entropy.

Third Law of Thermodynamics

The concept of zero entropy at absolute zero is formally stated in the Third Law of Thermodynamics. The Third Law states that the entropy of a perfect crystal at absolute zero is zero. A perfect crystal is a hypothetical substance that has a highly ordered and regular structure. It serves as a reference point for the determination of entropy.

Implications of Zero Entropy

The fact that a fluid at absolute zero has zero entropy has important implications. It suggests that at absolute zero, the fluid is in a state of maximum order and minimum randomness. All particles are in their lowest energy states and are arranged in a highly organized manner.

It is worth noting that the assumption of zero entropy at absolute zero is a simplification and an idealization. In reality, achieving absolute zero is not possible, and there is always some residual entropy present even at extremely low temperatures. However, for practical purposes, the assumption of zero entropy at absolute zero is a useful approximation.

In conclusion, at 0 K or absolute zero, fluids are assumed to have zero entropy. This assumption is based on the concept of the system being in its lowest energy state and having maximum order and minimum randomness.
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At 0 K, fluids are assumed to haveSelect one:a)maximum entropyb)minimum entropyc)fixed value of entropyd)zero entropyCorrect answer is option 'D'. Can you explain this answer?
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