A 25-mm-diameter hot surface at \(T_{s}=85^{\circ} \mathrm{C}\) is cooled by an air jet exiting a 5-mm-diameter round nozzle with a velocity of \(35 \mathrm{~m} / \mathrm{s}\) and temperature of \(25^{\circ} \mathrm{C}\). The nozzle exit is \(25 \mathrm{~mm}\) from the hot surface. Determine the percentage change in the average heat transfer coefficient at the hot surface if the air is replaced with carbon dioxide or helium.