Abstract: The invention provides a high pressure dynamic environmental chamber for analysis of solids in a liquid suspension in motion at pressures ranging from vacuum to 2000 bars or more and temperatures from ?50° C. to 500° C., using a liquid and/or a gas phase as pressurizing medium. The chamber is equipped with an entry window and an exit window so that the suspension can be illuminated and analyzed, using X-ray Diffraction, Raman Spectroscopy, Infrared Spectroscopy, or other photon radiation. The concept of direct analysis of a solid in suspension in motion over a wide range of pressures and temperatures is an important aspect of this invention. This motion is useful for X-ray diffraction analysis of the dispersed solid material, because it allows for a continuous change in the crystallographic orientation of the solid phase with respect to the primary X-rays while keeping the solid material in suspension.