Question: Which of the following statements is true regarding the second law of thermodynamics?

Options:

1. It allows for the conversion of heat into work with 100% efficiency
2. It states that energy can be created from nothing
3. It introduces the concept of entropy
4. It applies only to mechanical systems

Correct Answer: It introduces the concept of entropy

Solution:

The second law of thermodynamics introduces the concept of entropy, stating that the total entropy of an isolated system can never decrease over time.