Student essay written in en (native language: French, CEFR level: B1, field of study: Mathmatiques)

The sensation of gradien of temperature between iron at 19 degrees and plastic at 19 degrees when we touch those elements with our fingers, can be explained by the thermodynamic.
When we touch an iron bar at 19 degrees, the sensations on our fingers is colder than when we touch a peace of plastic. This feeling is due by the iron heat conduction, which is more important than the plastic heat conduction. So, iron can transfered easily the heat than the plastic. So when we touch an iron bar, the heat of our hand was transfered easier than when we touch a peace of plastic. So the temperature on our finger go down more quickly when we touch iron than when we touch plastic.This create a sensation of cold of our finger more important when we touch iron than when we touch plastic.That why we never use iron composit to create isolation for our house or other things which has to maintain a certain temperature on his surface. we must have to used timber, of polystiren to be able to maintain heat on our house. A very grate unconduct element is the aire, that why, in the windows, we can find between the two glaces, aire, to fight the conduction of the temperature from the inside to the outside.