When water turns to ice it expands (takes up more space) but doesn’t get any heavier since there isnt any matter being added to it. Therefore, it is less dense. Density is just a ratio of how much space something takes up versus how much it actually weighs. Something that takes up very little space but weighs a lot is considered more dense, whereas something light and spacious would be less dense.
If you’re talking about an equal volume (how much space it takes up) of two materials, whichever is denser will be heavier, so ice that has been melting or rained on will likely weigh more since it has more liquid matter per cubic inch than powdery fresh snow, for example.
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