Answer :
To act as an effective coolant in a car's radiator, a substance has to have the capacity to absorb a great deal of heat. The physical property is the best indicator for a good coolant is specific heat.
Specific heat capacity of the substance is the amount of heat energy required raise the temperature of the substance. A coolant should have the high specific heat capacity. The large amount of heat is required for a coolant to raise their temperature and if the coolant have high heat capacity it can absorb large amount of heat without heating much. The specific heat is the physical property of a substance.
Thus, To act as an effective coolant in a car's radiator, a substance has to have the capacity to absorb a great deal of heat. The physical property is the best indicator for a good coolant is specific heat.
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