低温高密度N2气体的状态方程

 将Beattie-Bridgeman（BB）方程和其改进形式Benedict-Webb-Rubin（BWR）方程应用于低温高密度的N₂气体，通过计算值与实验值的比较发现：在N₂气体温度低至150 K、压强达100 MPa和密度达临界密度ρ_c的2.548倍时，BWR方程仍能计算出可靠的结果，对低于临界温度的过冷气体也能给出较高准确度的计算结果，这说明该方程对低温高密度的N₂气体能准确描述。而BB方程却不适用于低温高密度的情况。

EQUATION OF STATE FOR GAS N2 AT LOW TEMPERATURE AND HIGH DENSITY

The present paper has calculated the p-V-T of gas N₂ at temperature 150 K and density not more than 2.548ρ_c using Beattie-Bridgeman (BB) equation of state and its modification Benedict-Webb-Rubin (BWR). It is surprisingly found that the BWR equation of state is accurate at such low temperature and rather high density. For example, the error is not more than 4.50% until 100 00 MPa of pressure, however, BB equation of state is absolutely invalid at the same condition. Therefore, BWR equation of state can represent the behavior of gas N₂ at or near the critical state as well as high density state.