The heat transfer rate due to free convection from a vertical surface, 1 m high and 0.6 m wide, quiescent air that is 20 k colder than the surface is known. what is the ratio of the heat transfer rate for that situation to the rate corresponding to a vertical surface, 0.6 m high and 1 m wide, when the quiescent air is 20 k warmer than the surface? neglect heat transfer by radiation and any influence of temperature on the relevant thermophysical properties of air. consider a large vertical plate with a uniform^face temperature of 130 degree c suspended in quiescent at 25 degree c and atmospheric pressure.