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axis de la sal
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the retarded van der waals force is called the casimir force and the diference between them is that in the oscilations in vacumm between to perfect metallics plates if there is a van der waals force virtual photons reach form one plate to the other in casimir the life time of the photon is not enough to the photon to reach the other plate but ok i can understand it but someone could make it more clear .