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Second Liquid – an Intermediate Phase of Sublimation

Abstract According to current concepts there is only one mechanism of intermolecular interaction (Van der Waals forces). The question arises: Why does liquid exist? The search for answer to this question leads to the assumption that there are two mutually independent mechanisms of intermolecular interaction. This assumption, taken as an initial postulate, provides the possibility of existence of some other modification of liquid which is totally different from ordinary liquid by its physical properties. It has been proposed that it is precisely this modification (second liquid) that is the intermediate state of matter in the sublimation process. The arguments in favor of this hypothesis are adduced. Specifically, the existence of two modifications of liquid helium might be considered a serious empirical argument; in the view of proposed approach, superfluid helium II is the second liquid of helium in the bulk phase.