Spherical and cylindrical bodies

GSS(Z Ri, R2) orGcc(Z Ri, R2) or Gim/2m(Z Ri, R2) h U Ti=—,h 2 x k kT kTIQQni P Used between spheres or cylinders of constant radii Ri, R2 of materials 1, 2. Planck s constant. Boltzmann s constant. Thermal energy. Thermal energy at room temperature. Pressure, negative spatial derivative of G per unit area between parallel planar surfaces negative pressure denotes attraction (a convention contrary to that in which pressure on a surface is defined in the direction of its outward normal 

Number densities of the set of ions of valence v in region i (with v subscript to distinguish from index in frequency summation and index of refraction). Number densities of suspended particles, molecules, atoms, polarizable units. 

Actual (computed) retardation screening factor for small differences in dielectric response, energy between parallel flat surfaces. 

Screening factor for point-particle interaction + I rn) energy. 

Incremental contribution of one particle to dielectric response of a dilute gas or suspension such that em of the medium becomes em + aN for a suspension. 

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