You blow a bubble around any solid, granular, or liquid object that weighs 500 pounds or less, causing it to float 4 feet off the ground. No matter what the contents of the bubble are, the bubble weighs 10 pounds and can be pushed using an action. Strong winds or effects that would push a creature also push the bubble. The bubble always floats at least 4 feet off the ground, and descends from a fall at a speed of 10 feet per round.   As an action, a creature can pierce the outside of the bubble, causing it to pop and releasing its contents.