The objective of the experiment is to provide students with visual images of phase behavior of CO2 as well as observation of the solubility of materials in supercritical CO2.
2-1 Basic properties of Supercritical fluids
A supercritical fluid is any substance at a temperature and pressure above its critical point, where distinct liquid and gas phases do not exist. It can effuse through solids like a gas, and dissolve materials like a liquid. In addition, close to the critical point, small changes in pressure or temperature result in large changes in density, allowing many properties of a supercritical fluid to be "fine-tuned".