Abstract
In this paper, pressure is calculated by the virial theorem in molecular dynamics. This research aims establishing a method to calculate thermodynamic pressure and verifying molecular dynamics and experiment. A system of argon vapor-liquid equilibrium is the object of this paper. Pressure calculated with the virial equation state in vapor phase of argon vapor-liquid equilibrium system agrees vapor pressure of experimental values. Calculated pressure of vapor system, same number density to vapor phase of vapor-liquid equilibrium system, agrees vapor pressure. Calculated pressure of liquid system have large difference between those values, however, it is expected the difference is smaller by increasing sampling number.
