Density-dependent pressures of gaseous CH_4, CO, and CO_2 were calculated by using the YHB radial distribution function at the temperatures -50∼100 ℃. The purpose of this study is to examine the applicability of YHB radial distribution function for low temperature behaviors of gas molecules which has been used mainly to examine high temperature and high pressure behavior of gaseous molecules at the temperature range of 100∼300 ℃ and the pressure range of 300∼3000 atm. The intermolecular potential function used was Stockmyer potential. This is to include intermolecular dipolar and quadrupolar interactions of CO and CO_2 molecules properly. The presures calculated were 1∼1000 atm. The calculated pressures corresponded well with literally known experimental data within 10% of error range. This indicated that the YHB radial distribution function is good enough to handle low temperature behavior of gas molecules.

-50∼100 ℃의 온도 범위에서 밀도 변화에 따른 CH_4, CO, 그리고 CO_2 기체의 압력을 YHB 동경분포함수를 이용하여 계산하였다. 이 계산의 목적은 주로 온도 범위 100∼300 ℃, 압력 범위 300∼3000 atm의 고온 고압의 조건의 기체 시스템의 거동을 조사할 때 사용하던 YHB 동경분포함수를 저온 범위로 확장하여 저온 기체시스템에서의 YHB 동경분포함수의 적용성 여부를 연구하였다. YHB 동경분포함수의 구성에 사용된 포텐샬은 CO와