Explain why pure liquids and solids can be ignored while writing the equilibrium constant expression?

Explanation

[Pure solid] or [Pure liquid]
` " " = (" No. of moles ")/(" Volume (in L)") = (" Mass // mol ,. Mas ")/(" volume") `
` " " = (" Density ")/(" Mol. Mass") = ` Constant.
(The density of a pure solid or a pure liquid is constant at constant temperature).