Abstarct: In this thesis, thermal pressure coefficient of Rubidium and Cesium liquid alkali mextals was calculated using different equations of state including Goharshadi- Morsali- Abbaspour (GMA), Ghatee- Bahadori, modified equation of state GMA (MGMA) and molecular thermodynamics method inciudes radial distribution function of hard- sphere at the contact point (molecular diameter) in the temperature range 500-1600K and pressure range 10-100 MPa. The calculated values were compared with available experimental data and amount of resulting error and temperature and density dependencies of thermal pressure coefficient were considered. In all studied states, the thermal pressure coefficient was increased with increasing in density and decreasing with tempreture. The results obtained for MGMA equation of state were shown that calculated values have a good agreement with experimental values. Furtheremore, thermal pressure coefficient of Rubidium and Cesium liquid alkali mextals were calculated using the hard- sphere radial distribution function at the contact point (isolated mulcular diameter).The results obtained for this method can be predict correctly the temperature and density dependencies of thermal pressure coefficient which showing a good agreement with experimental data in 1300-1600K temperature range for Rb mextal and 1200-1600K temperature range for Cs.