|
A gaseous substance below the critical temperature is called a
vapour while one above is either a gas or supercritical fluid
depending on the pressure. The critical point is characterised by
a liquid like density and a gaseous like diffusion and viscosity.
Physical properties of carbon dioxide can be found here.
Small
changes in temperature and pressure produce significant changes in
density and solvent power. An example of this is naphthalene which
is practically insoluble in low pressure carbon dioxide. At 100
bar the solubility is 10 g/L and at 200 bar it is 50 g/L. |
 |