Each time a warm object is surrounded by cooler air, the air that touches it will get very hot. The colder air farther absent gets heavier than this air. So, warmer, lighter air rises which is changed by colder, heavier air, which gets heated and rises. ) There you may https://dean0gu75.activablog.com/31390649/rumored-buzz-on-insulation-of-building-roofs