DENSITY OF LIQUID-HYDROGEN FLUORIDE BETWEEN 258 K AND 373 K AT PRESSURES UP TO 200 MPA

Densities of pure liquid hydrogen fluoride were measured in a piston-c ylinder type densimeter. The HF was contained in a bellow made of tetr afluormethylene, which was surrounded by methanol. This arrangement al lowed measurements to be performed over a temperature range from 258 K to 373 K, at pressures up to 200 MPa. The results could be well-descr ibed by the Tait equation, where both fit parameters show a systematic temperature dependence. When compared to other simple liquids, HF sho ws an unusually high compressibility over the whole temperature and pr essure range studied.