““Just as photons are scattered off the charged particle-antiparticle pairs fluctuating in the vacuum, electrical charges will interact with the virtual photons of zero-point radiation. Again, the resistance the physical vacuum might be opposing in this way to the propagation of the electron cannot be measured by comparison with any resistance an emptier space might offer; the charge emits, then absorbs a photon in the emptiest imaginable space. This is what makes vacuum effects observable im the first place-elementary particles don't just interact with each other. Their accompanying clouds scatter off the particles and off one another.””
