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Yes, you are right my friend, but will happen to its graph? The curve will be same just slower?

Thanks again. What will happen to the graphs when the material is not considered as lumped?

You mean something like this? If yes then the 120C is slower but its drop is also slower than the 30's drop.

Still something is not clear for me: If "they all come together at the ambient temperature" - then how the higher temperature drops faster? (sorry for the bad drawing) I mean - there are 2 points the graphs meat, but they all together only on the ambient temperature

Thanks again Petroleum. 1. Understood. But can you please provide a link where its says that big difference is for 500C+? I'd like to read that (not that I have a doubt, just to read more about this topic). 2. To simplify things let's assume I have only 3 cases: 30C, 90C and 150C. If I plot...

Thank you Petroleum for your reply. 1. In the link you provided its says: "The temperature difference between the body and the environment must be small". The differences as I mentiod are big (60C, 90C, 120C, 150C etc). So that might be relevant only for 30C. 2. I'm not sure what you offered...

Hi all, Let's say I have a material that is heated to a initial temperature. We can assume that the material is lumped system (according to the Biot number calculation). The material was heated and now its sits next to an air conditioner, which helps the cooling down to the room temperature...