Water has a specific gravity of 1.0. This means that a cubic centimeter of water would have a mass of 1.0 grams, while aluminum of the same size would have a mass of 2.8 grams. Since the aluminum cube displaces 1 cubic centimeter of water, it has a buoyancy of 1.0 grams. Archimedes Principle states that the buoyant force on a submerged object is equal to the weight of the fluid that is displaced by the object. The balloon and the basket displaces a fluid that is heavier than the balloon and the basket, so it has a buoyant force acting on the system.
Balloons tend to fly better in the morning, when the surrounding air is cool.
Find the weight of the air in a room with dimensions of 20 ft x 12 ft x 15 ft. An aluminum bar weighs 17 pounds in air. A balloon weighing 80 kg has a capacity of 1200 m 3 . Express your answer in newtons.