I feel so stupid, intuitively, when we were having this discussion I wanted to say that the level stays the same but when we were discussing with the person beside us, my partner said it would fall because water expands when it freezes, so when it melts, there'll be less displacement, so the water level would drop- this made sense to me so I was like okay alright guess this is it. Turns out, the water level stays the same- I somewhat understand why but along with clearing that up, I also want to know why the water level couldn't drop, and what was wrong with my partner's reasoning. This is what I understand though: If ice is already in the water, the water level would not change. The ice floats which means it is experiencing equilibrium, the ice is submerged as much as it needs to be -displaces as much water as it needs in order to float and be at equilibirum. When it melts, the volume of water the ice displaced to support it self, would be equal to the volume of the water coming from the melting ice cube, hence, the water level will not change (???? Not sure if I'm understanding this correctly) I guess as for my partner being incorrect, it's because they assumed that the volume when the ice melts is less than the displacement, when it's actually the same (???). I feel so dumb for not understanding this yikes.