állapotváltozóktól

In many scientific and engineering disciplines, particularly in thermodynamics and control theory, the term "állapotváltozóktól" refers to state variables. These are the minimal set of independent variables needed to describe the state of a system at any given time. Once the values of the state variables are known, the future behavior of the system can be predicted, assuming the system's dynamics are known. The choice of state variables is not unique, but they are typically physical quantities that are easily measurable and directly influence the system's behavior.

For example, in thermodynamics, the state of a simple compressible substance can be described by its pressure, temperature, and volume. These are considered state variables because knowing any two of them is usually sufficient to determine the third and the internal energy, enthalpy, and entropy of the substance. In control systems, state variables might represent quantities like position, velocity, or charge. The concept of state variables is fundamental for modeling dynamic systems and developing control strategies. Changes in state variables over time define the system's evolution. Understanding these variables is crucial for analyzing, predicting, and manipulating system behavior.