# The material derivative

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## Main Question or Discussion Point

hey pf! can someone please tell me if my understanding of the material derivative operating over some scalar $\rho$ is correct? basically, from my understanding if we take $\frac{ D \rho}{D t}$ this will tell us how $\rho$ changes as time changes AND how $\rho$ changes as we move our little piece of $\rho$ through space. is this correct?

thanks!

## Answers and Replies

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Yeah, I would say that's pretty much correct.