# first pressure derivative of bulk modulus at zero pressure

by sirwan
Tags: bulk, derivative, modulus, pressure
 P: 9 what is the physical meaning of first pressure derivative of bulk modulus at zero pressure. if it is ∂k/∂p, i say how it change with pressure, if it is at zero pressure?
 Sci Advisor P: 3,375 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.

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