Q. Assertion : Water is used as a coolant in automobile radiators as well as a heater in hot water bags.
Reason : Water has high specific heat capacity.

 1670  174 Thermal Properties of Matter Report Error

Solution:

Water is used as a coolant in automobile radiators as well as a heater in hot water bags because of its high specific heat capacity. Both assertion and reason are correct and the reason is the correct explanation for the assertion.