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If you mean *exactly* one cup by volume, you have the iceberg scenario.

The cup of frozen water will be less dense, so it will weigh less.

If you just freeze a cup of water, don't spill any, and *don't* trim the excess to bring the volume back to exactly one cup, then it will weigh exactly what it did at room temp.

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Q: What is heavier - a cup of water at room temperature or a cup of water frozen?
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