Russell
"The force represented by that vacuity is an expansion pressure which is the equal and opposite of the gravitative compression pressure and gives rise to that commonly believed error of light repulsion which is not true to nature." [Russell to NYT - 1930 November 2]

See Also

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beginning of expansion
Bjerknes Effect
center of high compression pressure
compression pressure force
Dispersion
Dissociation
electric expansion
electric pressure
Entropy
Expansion
expansion of the field
expansion pressure force
Explosion
Law of Diffusion or Expansion
omnipresent expansion
opposed curved-pressures
pressure condition in motion
pressure of motion
two-way compression-expansion sequence