Chiefly OS water cools more efficiently than air.
Much like a modern motorcycle where most manufacturers have gone over to water cooled engines for reliability and efficiencies in cooling.
Water plays a crucial role in modern Data Centers by enabling effective, energy-efficient cooling—allowing data-intensive operations to run reliably 24/7 and supporting the growing demand for computing power.
Water is used in various cooling systems—such as chilled water systems, evaporative cooling units, and rear-door water-cooled racks—because it is much more efficient at absorbing and transferring heat than air. This prevents cooked server motherboards rendering the data center useless plus preventing very costly repairs and expensive downtime with irate customers.