More Perovskite

Cesium lead tribromide ($CsPbBr_3$) perovskite nanocrystals,$Z_m=55+82+35*3$, with density $4.83\,gcm^{-3}$, and molar mass (calculated) $579.82\,gmol^{-1}$, 

$v_{boom}=3.4354*\cfrac{4830}{55+82+35*3}=68.57\,ms^{-1}$

$T_{boom}=68.57^2*\cfrac{579.82*10^{-3}}{2*8.3144}=163.95\,K$ or $-109.20^oC$

 By themselves these values are not indicative.