This is really cool, look at the balloon it can't sink. So according to Archimedes, if the weight of an object is equal to the weight of the water it displaces, then the object will float. Because the balloon is full of water and the density is the same. Therefore the balloon will float. Because a balloon can only sink if the weight of the balloon is greater than the weight of the water it displaces.But if you want the balloon to sink, try doing this. If you want to submerge a balloon (full of water) into water, there is a way. What you can do is take hot water and put a balloon in it. It will sink. This is because the density of warm water is smaller than cold water and in this case the weight of the balloon will be greater than the weight of the volume moved.Hope you can help

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