Yes, it is possible to weigh down a balloon to make it float in the same spot in the air. By attaching additional weights or objects to the balloon, you can counteract its natural buoyancy and create a balance that allows it to remain stationary in the air.
The amount of weight needed to achieve this balance depends on various factors, including the size and buoyancy of the balloon, the density of the surrounding air, and the desired stability of the floating position. It may require some experimentation to find the right combination of weights and attachments to achieve the desired result.
Keep in mind that the weight added to the balloon needs to be carefully balanced to ensure that it neither becomes too heavy to float nor too light to maintain stability. Additionally, factors such as air currents or temperature changes can affect the floating behavior of the balloon, so adjustments might be necessary to maintain its position in changing conditions.