Verification.....
Water has the best overall qualities of a liquid, especially being the "universal solvent" it'll meld with anything, however, it will corrode things(because of oxygen dissloved in it) and will freeze when below 0 C or boil at 100 C (32 and 212 I believe for you imps) as well as transfer bacteria and fungus.... it also contains minerals that can precipitate out and block the passageways of your radiatorCoolant is highly "viscous" meaning thick and slows down flow rate (which allows for better heat transfer), lowers the freezing point and raises the boiling point of water, prevents the bacteria and fungi from "evolving", removes the "corrosion" factor of water, and doesn't allow the minerals in the water to precipitate...
So when looking at it, it does change its "cooling capacity" as such, however, it is in essence a "new chemical" not water, nor coolant....
Hope this confirms the verification...
Allan