However, the energy input must match precisely therequirements for altering the electron configuration. This polarity sets upthe formation of hydrogen bonds. These bonds, though weak in nature, play an important role in biologicalstructures. These are theweak interactions that cause oil droplets to form in water. Because water is polar , it is an excellent solvent for polar molecules.
Water is cohesive.
This means that water molecules are held together byhydrogen bonds. As a result, evaporation of water from a surface requiresenergy to break the H-bonds, and thus sweating is a mechanism for losing excessbody heat. So ice floats. Water resists temperature changes. Before the temperature of waterchanges, energy must be used to break the hydrogen bonds.