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.
The London dispersion forces are however very weak and will most likely not last long. Hydrogen bondings can be simplified and said to be a strong version of a dipole-dipole bonding which occurs when the positively charges side of a molecule consists of Hydrogen and it binds to one of the three most electronegative elements (Nitrogen, Oxygen and Flourine.)