# Balloon travelling upwards while it releases air

See the below image for the Balloon travelling upwards while it releases air diagram. The air pushing outwards in the direction of the balloon is just leaving the balloon without opposing the air pushing in its opposite direction so the balloon is getting pushed in that direction opposite the opening. Originally Answered: A balloon filled with air and with its mouth downwards is released, it moves upwards. why?

When you open the balloon, the pressure difference moves the air from inside to the outside : F (force applied by the balloon envelope) = m (mass of the ejected air) * a (acceleration given to the air). But every action has a reaction : as the air is accelerated toward the ground, the balloon is accelerated in the opposite direction.

A balloon is filled with air and released with its mouth downwards. Why does it move upwards? – Quora A balloon is filled with air and released with its mouth downwards. Why does it move upwards?