Poromechanics of microporous media

► We derive poromechanical equations that are valid even for microporous media. ► Adsorption and strain in microporous media can be coupled. ► Adsorption of fluid can induce non-linear behavior of the medium. ► The poromechanical response of a microporous medium to adsorption significantly depends on the pore size distribution. ► The derived equations are relevant for adsorption of methane in coal.