Engineering Physics Annotation << Back On ponderomotive forces for dissipate media at finite temperature B.A. Veklenko By considering of resonant radiation pressure on the thin slab of thermal excited atoms it is shown that the light force action on dissipate media in general case can not be expressed using conventional dielectric permittivity even if approximate calculation are used. The quantum properties of resonant light at the presence of excited atoms manifest themselves on macroscopic level. E-mail: VeklenloBA@yandex.ru. Pp. 16-22.