A painter on a ladder, painting the ceiling of a room comments. "It is hotter up here by the ceiling than it is down on the floor". Explain why his observation is correct.

convection

Explanation:

His observation about the ceiling been hotter than the floor is correct because the ceiling is the region of the room that it higher, and the reason for the heat experienced by the painter is caused by the expansion of air as the air expands the air gets lighter and it rises with the heat to the top/ceiling of the room , therefore leaving the cold air down the floor

This phenomenon is called heat convection i.e transfer of heat by movement of fluid ( air/gas or liquid )from a region of higher temperature to a region of lower temperature