Scaling law for high pressure isotherms of solids

A new analytical form is proposed for the description of experimental data on strong isothermal compression of solids. This form supposes similarity transformations. It is shown that a scale of volume and a scale of pressure can be determined so that the experimental isotherms of solids (H2, MgO, Au, NaCl, diamond, Al, Mo, Cu, Pb) are transformed to a uniform curve up to 300 GPa. The scaling law is proposed for the isothermal bulk modulus of a solid too. A new definition of the ‘high pressure’ for a solid is suggested.