Isotherms of CO 2 between 70 and 3000 atmospheres (Amagat densities between 200 and 600)

In the previous paper the technique and results of isotherm measurements up to densities of 200 Amagat units were described. For higher densities, however, the method used has the disadvantage that either the final volumes of the gas will be very small or the initial volume must be very large. The first would lead to inaccurate density measurements, the second to an enlargement of the steel container, which must stand 3000 atmospheres pressure so that the apparatus would be rather bulky. The apparatus was therefore altered so that the piezometer could be filled and the normal volume determined under pressure, but, by taking this pressure between 20 to 50 atmospheres, use could be made of the isotherm measurements described in the previous paper.