Dühring's rule is a basic law in chemistry that helps us understand how some molecules can react with other molecules. It states that when 2 molecules come together and react, the molecule with the weaker bond (or the one that binds to the other molecule less strongly) will be the one that switches its bonding partner. Put more simply, the one with the weakest bond will let go and move on. This is an important rule because it helps us predict how and why molecules react in certain ways.