How can specific heat capacity be used?
It is used extensively in heat transfer operations in chemical plants and in every form of air-conditioning.
The ability of a substance to absorb or release heat without changing state (although changes of state are also quite useful) is the basis for many industrial and commercial/home heating and cooling applications.
Water is the most common fluid due to its availability, environmental neutrality and high heat capacity. Other fluids are used in specific processes that require temperatures outside of the useful range for water or other reactivity considerations.