# Santos-Lopez de Haro-Yuste hard disk equation of state

The **Santos-Lopez de Haro-Yuste** equation of state for hard disks (2-dimensional hard spheres) is given by (Eq. 2 Ref. 1, Eq. 5 Ref. 2, Eq. 1 Ref. 3):

where is the pressure, is the number density, is the Boltzmann constant, is the temperature, is the reduced second virial coefficient, is the packing fraction, with the area of a hard disk with diameter , and

## References[edit]

- A. Santos, M. López de Haro, and S. Bravo Yuste "An accurate and simple equation of state for hard disks", Journal of Chemical Physics
**103**4622 (1995) - Mariano López de Haro, Andrés Santos and Santos Bravo Yuste "A student-oriented derivation of a reliable equation of state for a hard-disc fluid", European Journal of Physics
**19**pp. 281-286 (1998) - Mariano López de Haro, Andrés Santos, and Santos B. Yuste "Simple equation of state for hard disks on the hyperbolic plane", Journal of Chemical Physics
**129**116101 (2008)