If you were to let go of a helium balloon inside the International Space Station (ISS), it would not float upwards as it does on Earth. In microgravity conditions aboard the ISS, there is no upward force due to buoyancy like we experience on Earth's surface.
Instead, the balloon would likely float freely in the microgravity environment inside the ISS. It would move in whatever direction it was initially released or pushed, and then continue to float in that direction until acted upon by another force or object. Due to the absence of significant air resistance, the balloon would keep moving until it encounters another object or is affected by another force, such as air circulation systems or the movement of astronauts or equipment.
In summary, in the microgravity environment of the ISS, a helium balloon would not rise or float upwards as it does on Earth. It would move in a straight line or follow the direction it was initially released or pushed, maintaining its momentum until influenced by external factors.