record the mass accurately measure and observe the mass and the volume of the different objects use appropriate apparatus and methods to measure volume and mass and ...

At its core, DFT postulates that the ground-state energy of a quantum system is a functional of the electron density. This principle ... In practice, DFT calculations involve approximating the ...

Density is the mass per unit volume. Density can be found using this equation. Density is sometimes measured in g/cm 3. Make sure that you use units that are consistent with the question in an exam.