specific heat capacity

Water has a high specific heat capacity, it takes in a lot of energy without big rise in temperature. So it can be used as a coolant. For example, coolat in motor car.

The watery fluids in human body have high specific heat capacity, so body temperature xan be maintained even there are big changes in temperature in surrounding environment.

For coastal cities, for example, Hong Kong, we have mild winters and cooler summer because due to the high specific heat capacity of the sea water