Question

Water is used as a coolant in automobile radiators because ?

Answer 1

Hint: A coolant is a substance that is used to reduce or regulate the temperature of a system. It is typically liquid or gas. A perfect coolant has a high thermal capacity, low viscosity, is inexpensive, non-toxic, chemically inert, and does not cause or promote cooling system corrosion. In some cases, the coolant must also be an electrical insulator.

Complete answer:
Radiators are heat exchangers that are used to cool internal combustion engines, such as those found in automobiles, piston-engined aircraft, railway locomotives, motorcycles, stationary generating plants, and other applications.Because of its high specific heat capacity, water is used as a coolant in automobile radiators.

As a result, for every degree increase in temperature, it absorbs a large amount of heat.Due to its low electrical conductivity, very pure deionized water is used to cool some electrical equipment, particularly high-power transmitters and vacuum tubes.Heavy water is a neutron moderator that is also used as a coolant in some nuclear reactors.

Ordinary (light) water is used in light water reactors, which include both boiling water and pressurised water reactors. Some designs, such as the CANDU reactor, use both types of water: heavy water as a moderator and supplementary coolant in the nonpressurized calandria tank, and light water as the primary heat transfer fluid.

Note: The coolant is kept at a higher-than-atmospheric pressure to increase its boiling point because the thermal efficiency of internal combustion engines increases with internal temperature. The radiator's fill cap usually includes a calibrated pressure-relief valve.This pressure varies by model, but it usually falls between 4 and 30 psi.