2. A vertical manometer filled with water is connected to a tank filled with air on one end and open to the atmosphere on the other end. The water level in the manometer on the tank side is exactly 10 feet lower than the water level on the side open to the atmosphere. If the volume of the tank is 200 ft', calculate the weight of the air inside the tank. Assume sea level standard conditions outside the tank and equal temperatures inside and outside the tank.