The modern results of investigation of physical properties of matter a
t extremely high pressure and temperature are presented. The high inte
nsity shock waves techniques are used for compression and an irreversi
ble heating of a dense plasma in shock and rarefaction waves. The clas
sification of plasma states are discussed and modern theoretical model
s of strongly coupled hot matter are described. The specific peculiari
ties of the dynamical experiments are discussed in connection with nuc
lear and chemical methods of shock waves generation. The shock and rar
efaction waves experiments give a new information on thermodynamical a
nd optical properties of strongly coupled plasmas. The problems of ''p
lasma'' and ''metal - insulator'' phase transitions high temperature e
vaporation are discussed. The attention was paid to the effect of disc
rete spectrum on thermodynamics of strongly coupled plasmas.