Review. High pressure techniques used in the paramagnetic resonances

The aim of this review-paper is to overview high pressure techniques used in the magnetic resonances in laboratories. In this review, we would like to show the techniques that lead yielding high pressure applicable in the paramagnetic resonances. We would like to draw your attention to the separation of the effects resulting from the pressure and effects from the temperature, thereby separate the volume phonon contribution. Our main intention is to show the impact of high pressure on the structure of matter, in particular on its fundamental level.