Hi everybody! Well, these are just two basic questions that are bothering me. 1.When it is said that, for example, a Cryocooler has 1W of cooling power at 4.2K, what does it really mean? To me, the action of "cooling" depends on the material that it's being cooled down. So, for different materials, what will happen is that they will take more or less time to cool down. Is that it? 2. Using a gas/liquid for cooling down some material, can we define it's cooling power as being: P=q*cp*ΔT, being q the mass flow (kg/s), cp the gas/liquid specific heat and ΔT the difference in temperature between the temperatures at the inlet and outlet of the system to be cooled down? So, for you, what's the meaning of cooling power? Thanks in advance!