Use mass density , with . The rock salt structure has formula units per conventional cell; the CsCl structure has . In pressure order the densities are approximately
(1)
The increase across the transition is approximately , much greater than the smooth compression within either branch. Comparing directly without correcting the different would create a fictitious volume discontinuity.
Figure 1.
KCl density calculated separately for the two crystal structures
. Original calculation from cell mass and volume. The narrow gap brackets the transition; separate lines avoid implying a continuous single-phase density through the jump. Details.

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