An empty storage tank has a volume of 4,600 ft3. What is the buoyant force exerted on it by the air? (Assume the air is at 0°C and 1 atm.)

Answer 1

Well, Bob H., that depends on what you consider as bouyant force. If it's the entire upward component of the external pressure, then take the volume * density * grav. constant. But, I suspect, here "empty" means filled with air? In that case, the NET bouyant force is zero -- the weight of the air inside equals the bouyant force of the air outside.

-- Cheers, --Mr. d.