A relatively air-tight room has a floor area of 6 m by 4 m and a height of 3 m. It has a door of width 1 m with a 1 cm high slit at the floor level. A hydraulic oil leak has ignited, causing a fire with an effect of 100 kW. Calculate the pressure difference that arises, the velocity in the opening, and the mass flow through the slit. What happens if the slit is made 10 times