Air flowing through a horizontal, insulated duct was studied by students in a laboratory. One student group measured the pressure, temperature and velocity at a location in the duct as 0.95bar, 670C, 75m/s. At another location the respective values were found to be 0.8bar, 220C, 310m/s. The group neglected to note the direction of flow, however. Using the known data, determine the direction.
