Anti-de Sitter space bell. It might be described as being the "opposite" of the surface of a sphere, which has a positive curvature. General relativity is a theory of the nature of time, space and gravity in which gravity is a curvature of space and time that results from the presence of matter or energy. Energy and mass are equivalent (as expressed in the equation "E" = "mc"), and space and time can be translated into equivalent units based on the speed of light ("c" in the "E" = "mc" equation). A common analogy involves the way that a dip in a flat
Mie–Gruneisen equation of state = 0) we have "A" = 0. Similarly, if we assume "p" = 0 when "V = V" we have "B" = 0. The Mie-Grüneisen equation of state can then be written as where "E" is the internal energy per unit reference volume. Several forms of this equation of state are possible. If we take the first-order term and substitute it into equation (2), we can solve for "C" to get Then we get the following expression for "p" : This is the commonly used first-order Mie-Grüneisen equation of state. Mie–Gruneisen equation of state The Mie-Grüneisen equation of state is