Question

How does temperature change affect water's cohesion?

Answer 1

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Answer 2

Water's cohesion comes from the relatively weak, transient inter-molecular forces (also called 'non-bonded interactions') between different water molecules. These interactions have very weak energies associated with them - so they form and break very readily.

Raising the temperature by heating the water would increase the amount of energy in the system. So with more energy available, what effect do you think this would have on the rate of weak bond formation and breaking?

Answer 3

Or for a less theoretic treatment, think about the simple every day case where you add energy to water by heating it, it boils, and all the water molecules go floating off into air?

Answer 4

The colder the temperature climate, the more cohesive water gets due to the process of conversion of liquid to solid. On the opposite end, the cohesive coefficient is less when the temperature climate is higher due to the same conversion process, but from liquid to gas. Specifically, it has to do with the bonds.