1 Raised over Fort McHenry on the morning of September 14, 1814, to signal American victory over the British in the Battle of Baltimore; the sight inspired Francis Scott Key to write The Star-Spangled Banner. 2  Preserved by the Armistead family as a memento of the battle.
London dispersion forces are a type of intermolecular force. They are relatively weak. They are also called induce-dipole induce-dipole interactions. 1  Present in non-polar molecules.  Due to non-systematic electron distribution where one molecule induces a dipole on another molecule.
A temporary dipole on one molecule (formed by the random motion of. electrons in the molecule) induces a temporary dipole on neighboring molecules. These temporary dipoles experience attraction for each other. London forces exist between all types of molecules. The strength of. London forces depends on the molar mass of the molecule (higher MM â more. electrons â more polarizable â stronger London forces) and, to a lesser extent, on surface area (greater surface areaâ stronger London forces).