Reason For the Rise of Helium Balloons
The standard answer to that is helium balloons go up because they are lighter than air. Because helium is far less dense than the nitrogen and oxygen in air, helium balloons are buoyant.
As long as helium plus balloon is lighter than air being displaced, then balloons will float in air and ascend. You will still need enough volume of balloon to dispense enough air around it.
Because Helium Gas has lower density than oxygen, a balloon filled with helium will go up. As a balloon ascends, the surrounding air pressure decreases, and the helium within expands. It is still just enough pressure to push helium across the walls of a balloon, just as water runs down paper towels.
As the latex helium balloon ascends, the outside air pressure decreases, but the pressure from within the balloon remains unchanged. The force on ascent will exceed the helium balloons weight. Since the body submerged in fluid would be raised upon releasing, that buoyant force should be greater than the weight of a helium-filled balloon. In other words, the weight of a helium-filled balloon is smaller than the weight of the volume of air it displaces, meaning that it is less dense than the air that a helium-filled balloon displaces.
Knowing the volume of air displaced by a helium balloon, we can work out the maximum mass that a balloon could carry. That the helium-filled balloon experiences net uplift means the helium-filled balloon can lift an object that is no heavier than that net uplift. Helium from Disposable Helium Tank is used because the density of helium is very low. When helium particles are heated, they expand, which causes the balloon to expand too.
In this situation, a helium balloon that you are holding on to with your rope is floating on an air pocket. When something experiences force, we usually attribute this force to some agent, but in the case of the helium balloon, the agent in charge seems rather enigmatic. A hot-air balloon floats through the atmosphere, while an ordinary air-filled balloon would not.