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The first law of thermodynamics states energy conservation from "summary" of Thermodynamics and an Introduction to Thermostatistics by Herbert B. Callen

The first law of thermodynamics is a fundamental principle in the study of energy and its transformations. It provides a concise statement regarding the conservation of energy. According to this law, energy can neither be created nor destroyed; it can only change forms or be transferred from one system to another. In essence, the total energy of a closed system remains constant over time. This law is based on the principle of energy conservation, which is a cornerstone of modern physics. It reflects the idea that energy is a fundamental quantity that underlies all physical processes. The first law of thermodynamics serves as a powerful tool for understanding and analyzing various systems, from simple mechanical devices to complex chemical reactions. The first law of thermodynamics can be expressed mathematically as ΔU = Q - W, where ΔU is the change in internal energy of a system, Q is the heat added to the system, and W is the work done by the system. This equation highlights the relationship between heat, work, and internal energy, and it provides a framework for quantifying energy transfers within a system. In practical terms, the first law of thermodynamics allows us to predict how different forms of energy will interact and change within a system. By accounting for the heat added to a system and the work done by the system, we can determine the resulting changes in internal energy. This knowledge is crucial for designing efficient processes and optimizing energy usage in various applications.
  1. The first law of thermodynamics is a foundational principle that governs the behavior of energy in physical systems. By understanding and applying this law, scientists and engineers can better comprehend the complexities of energy transformations and make informed decisions about energy utilization and conservation.
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Thermodynamics and an Introduction to Thermostatistics

Herbert B. Callen

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