Question

Water is used as a coolant because of its _______.

• A. lower density
• B. easy availability
• C. low specific heat
• D. high specific heat

Answer 1

The correct option is D high specific heat

A coolant is a substance, typically liquid or gas, that is used to reduce or regulate the temperature of a system. An ideal coolant has high thermal capacity, low viscosity, is low-cost, non-toxic, chemically inert, and neither causes nor promotes corrosion of the cooling system. Some applications also require the coolant to be an electrical insulators.

Water is the most common coolant. Its high heat capacity and low cost makes it a suitable heat-transfer medium. It is usually used with additives, like corrosion inhibitorsa nd antifreeze. Antifreeze, a solution of a suitable organic chemical (most often ethylene glycol, diethylene glycolic, or propylene glycol) in water, is used when the water-based coolant has to withstand temperatures below 0 °C, or when its boiling point has to be raised.

Hence Option D is correct