What is the sphere of molecular action?

(N/A) The sphere of molecular action is defined as the imaginary sphere drawn around a molecule as the center,with a radius equal to the molecular range (approximately $10^{-9} \ m$).
Within this sphere,the molecule exerts a significant attractive force on other molecules.
Any molecule located outside this sphere does not experience any significant force of attraction from the central molecule because the intermolecular forces are short-range forces.