Dispersion Force

Imagine trying to keep a stack of loose papers neatly organized on a windy day. Just as the wind can temporarily shift the papers, causing them to flutter and create little gaps or overlaps, electrons in atoms can shift, creating temporary charged regions. These temporary charges in atoms lead to weak attractions, much like the way a small gust of wind can momentarily pull paper edges together or apart. Just as the wind's effect is temporary and fluctuating, so too is the interaction between atoms due to the shifting electrons, leading to what's known as dispersion forces.