2008 年 18 巻 4 号 p. 328-334
In this article, a brief review of two different types of molecular fluids is given. One is hydrogen-bonded fluids such as water and lower alcohols, for which the molecules are preserved even in the supercritical condition. The other is covalently bonded fluid selenium, where the twofold coordinated chain structure is broken by thermal agitations and the fluid undergoes a semiconductor-metal transition near the critical point.