# Formalism of equilibrium thermodynamics Thermodynamics, the study of the behaviour of physical systems in terms of their macroscopic observables. A physical theory that perhaps is closest to our macroscopic perception of the physical world. ## References * A.M. Steane, *Thermodynamics*, Oxford University Press, 2017. * Dep. of Physics Oxford University, *Basics of Thermodynamics*. * D.A. Lavis and R. Frigg, *The Fundamentals of Thermodynamics*, Springer, 2025.