Due to vacancy defects,the density of a solid substance .............

The defect that arises when smaller cations move into interstitial sites in a crystal lattice is known as ..............

Potassium crystallizes in an $FCC$ lattice with a unit cell edge length of $0.5 \ nm$. The approximate density (in $g \ cm^{-3}$), if it contains $0.1 \%$ Schottky defects, is:

In a solid lattice,the cation has left a lattice site and is located at an interstitial position. The lattice defect is:

In the Schottky defect,

Explain vacancy defect and interstitial defect.