An empty balloon weighs 100gm. How much will it weigh if 100gm of air is filled in the balloon at one atmospheric pressure?
Given that an empty balloon weighs 100 g. If this same amount of air is filled in the balloon at one atmospheric pressure, then the same volume of atmosphere will be displaced as much it is inside the balloon. This increase in weight of the balloon due to weight of air is balanced by the upward thrust. So, the actual weight of the air filled balloon will remain the same, i.e., 100 g.