What exactly do "state of a system" and "state variables" mean?

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Discussion Overview

The discussion centers around the concepts of "state of a system" and "state variables" within the context of thermodynamics. Participants seek to clarify the intuitive understanding of these terms and their implications for characterizing different systems.

Discussion Character

  • Conceptual clarification

Main Points Raised

  • One participant requests an intuitive understanding of the state of a thermodynamic system and the meaning of state variables.
  • Another participant suggests that intuition can vary among individuals and encourages a more specific question to facilitate understanding.
  • A third participant provides a link to an external resource as a starting point for further exploration.
  • One participant defines the state of a system as a characterization based on measurable quantities, providing examples such as temperature, density, pressure, and mass for a gas container, which are identified as state variables.
  • Another participant emphasizes that the state must be a complete description of the current situation of the system, sufficient to predict future behavior, using the example of a pendulum's velocity and height.

Areas of Agreement / Disagreement

The discussion does not appear to reach a consensus, as participants express varying levels of understanding and provide different examples and definitions without resolving the nuances of the terms.

Contextual Notes

Some definitions and examples provided may depend on specific contexts or assumptions about the systems being discussed, which remain unresolved.

Kaushik
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Could someone provide me with the intuitive understanding of state of a thermodynamic system? What does state variables/parameters mean?
 
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The wikipedia Thermodynamic state article is reasonably straightforward -- what is intuitive is often different for one person compared to another -- perhaps you can formulate a more specific question.
 
State of - the way or being that exists at a particular time.

The state of a system is the characterization of that system (an object or situation) by the specification of measurable quantities which describe the system. Example. a container of a gas. The state of this systems is described by its temperature, density, pressure and mass. These quantities are known as the state variables. Other systems as electrolytic cells . pieces of dielectric material, or a solutions have different state variables that characterize them.
 
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The state must be a description (usually as variable values) of the current situation of the system that is complete enough to determine the future behavior of the system as it is reflected in those same variables. The state of a pendulum would be the velocity and height of the weight.
 
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