[Prophet in the wilderness]

I wonder ? if you took 1 oz of water put it in a cup ( first weigh the cup ) and took the same amount of water ( 1 oz ) and froze it, and weigh the froze water, would both be the same weight ? or would the froze water of the same amount ( 1 oz ) weigh less ?

[RobbyS]

Water expands as it freezes, forming a crystal structure.

[quantim]

Sort out the difference between 'weight' and 'mass' and you'll know. And how Earth is spinning relative to the Sun, and how fast the Sun is moving around the center of the Milky Way Galaxy, and how this Galaxy is moving relative to the observable Universe.

If you had any idea on how fast you were moving through space relative to other major bodies even though you think you're sitting still you'd pee your pants if you could calculate how fast you're flying now. It's basic Newtonian math.

[Doe Eyes]

Floating is a volume/weight thing. Ice floats because it has a greater volume per unit weight than water. Same with boats.

[BlazingArizona]

I wonder ? if you took 1 oz of water put it in a cup ( first weigh the cup ) and took the same amount of water ( 1 oz ) and froze it, and weigh the froze water, would both be the same weight ? or would the froze water of the same amount ( 1 oz ) weigh less ?

They weigh the same, of course, but the frozen water expands, being less dense, and therefore floats.