If Keiji stands at the edge of a cliff on a calm day, holding a balloon on a string, and he releases the balloon, where will the balloon go and why does it not fall to the ground like other objects?

Provide a very brief response.
When Keiji releases the balloon, it will rise upwards instead of falling. This occurs because the balloon is filled with a gas that is less dense than the air outside the balloon, most likely helium or hydrogen. These gases are lighter than the mixture of gases in the atmosphere, so the force of buoyancy (which is the upward force exerted by the surrounding air) is greater than the force of gravity pulling the balloon downward. As a result, the balloon ascends until the forces balance out at a higher altitude or the balloon's material can no longer contain the gas under lessening external pressure.