The same basketball, is the inflated basketball heavy or not? (inflated)

The same weight, the reason is very simple, let me give an example, for example, we tear the basketball into pieces, then weigh it on the ground and write down a number; Then assemble the basketball. Of course, the assembled basketball can be used. When it is finished, we weigh it and find that it is the same weight, because we are full of air, not other gases, such as oxygen or nitrogen or other gases. Because the density of these gases is different, it will affect the weight, but we are full of air, so the weight of basketball will not change.