To understand the London Force or gravity it is important to understand how groups of particle stick together. This stickiness is additive and as an object gets bigger there tends to be a larger force pulling the mass together. I'd like to look at why.
A sphere is going to be more crowded at the center than at the periphery. Secondly, an atom may be modeled as a sphere with electrons on the outside and with an ionic core. The electrons on the outside of atoms will interact at the center of a mass (perhaps a sphere) and produce an elevated negative charge level as one approaches the center of mass. The opposite occurs at the periphery of a sphere of mass becomes more relatively positive than the center. The mass doesn’t have to be a sphere.
At the periphery of mass the atoms and molecules will seem to bend outwards. The negative charge will be relatively sparse compared with the center of mass. An inversion layer will look to occur now between the charge at the center and periphery of the mass. This inversion layer is similar to that of a semiconductor depletion layer except it is a progression throughout the mass rather than a discrete line between different doping profiles in a semiconductor.
Electrons will push outwards from the center of mass to the periphery. Charge balance will pull them back. Electrons and holes will be dragged towards the center of mass. This creates the London force or gravity.
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