Question

The substance that absorbs and releases heat in a cooling system?

Answer 1

The name of the substance is coolant. It is because it both absorbs as well as released the heat content in the cooling system.

The best coolant comes with an increased thermal capacity and low viscosity. It is a non-toxic, low-cost and also chemically inert.

It does not promote corrosion in a cooling system. In fact, few applications need this coolant as the electrical insulators.

Answer 2

$\textbf{\large{Answer-}}$

The substance that absorbs and releases heat in a cooling system?

The substance that absorbs and releases heat in a cooling system is $\textbf{\underline{coolant.}}$

Reason :

It both absorbs and releases the heat content.