# First pressure derivative of bulk modulus at zero pressure

by sirwan
Tags: bulk, derivative, modulus, pressure
 Sci Advisor P: 3,565 It means $\partial k/\partial p|_{p=0}=\im_{\Delta p \to 0}(k(0+\Delta p)-k(0))/\Delta p$ I.e. it is the change of bulk modulus when you increase the pressure slightly starting at p=0. This is analogous to asking about the accelleration of a car dv/dt at zero speed.