The equation of state (EOS) of a solid (pressure–volume relation) plays an important role in condensed matter physics, which are very useful for the general understanding of the behaviour and the application of condensed matters. Its role becomes more crucial especially in case of those materials which have high range of compressibility. In the present work, pressure of three different alkali metal halides viz. NaI, KI, and RbI has been calculated at different compression ranges using four different isothermal equation of state (EOS) viz Kumar EOS, Shanker EOS, Brennan Stacey EOS, Poirier- Tarantola EOS. A critical analysis and comparative study among the calculated values of pressure to test the validity of various equations of states suggest that Shanker EOS gives good agreement with experimental result.
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