State Variable - Examples

Examples

  • In mechanical systems, the position coordinates and velocities of mechanical parts are typical state variables; knowing these, it is possible to determine the future state of the objects in the system.
  • In a thermodynamic system, properties such as temperature, pressure, volume, internal energy, enthalpy, and entropy are state variables.
  • In electronic circuits, the voltages of the nodes and the currents through components in the circuit are usually the state variables.
  • In ecosystem models, population sizes (or concentrations) of plants, animals and resources (nutrients, organic material) are typical state variables.

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