Question

why a blown up football is heavier than a blown out football

Answer 1

we know that every matter surrounding us occupies some space and have some mass and weight therefore air is also a matter it means that it also have weight that is why when we blow air into football it becomes much heavier as compared to a not blown football.......

Answer 2

IT IS SIMPLE..... A BLOWN UP FOOTBALL IS HEAVIER THAN A BLOWN OUT FOOTBALL AS WHEN A FOOTBALL IS BLOWN THE MASS OF THE AIR ALSO GET ADDED TO THE MASS OF FOOTBALL.