English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

It is generally agreed that the supercritical region of a liquid consists ofone single state (supercritical fluid). On the other hand, we show here thatliquids in this region exist in two qualitatively different states: "rigid" and"non-rigid" liquid. Rigid to non-rigid transition corresponds to the condition{\tau} ~ {\tau}0, where {\tau}is liquid relaxation time and {\tau}0 is theminimal period of transverse quasi-harmonic waves. This condition defines a newdynamic line on the phase diagram, and corresponds to the loss of shearstiffness of a liquid at all available frequencies, and consequently to thequalitative change of many important liquid properties. We analyze the dynamicline theoretically as well as in real and model liquids, and show that thetransition corresponds to the disappearance of high-frequency sound,qualitative changes of diffusion and viscous flow, increase of particle thermalspeed to half of the speed of sound and reduction of the constant volumespecific heat to 2kB per particle. In contrast to the Widom line that existsnear the critical point only, the new dynamic line is universal: it separatestwo liquid states at arbitrarily high pressure and temperature, and exists insystems where liquid - gas transition and the critical point are absentoverall.

Two liquid states of matter: A new dynamic line on a phase diagram