Abstract
Molecular dynamics computer simulation of pure argon fluid was performed under NTV or NEV ensemble around critical point. Macroscopic fluctuation behavior drastically changed around the critical point. Atom level density of the liquid fluctuates in space and time. Spatial fluctuation is analyzed by time averaged pair correlation function g(r) and static structure function S(q). Temporal fluctuation is done by instantaneous them. Long and medium range spatial density fluctuation shows low q correlation in S(q) profile. The fluctuation size is derived from S(q)q^<-2>.
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