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Too vague a question. If you mean, does sealing the cup change the mass, then no it does not change the mass of the water, though the sealing material would add its own mass to the total.

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6y ago
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5mo ago

Yes, the mass of the sealed cup of water would remain the same as long as no water is added or removed from the cup. The mass is a measure of the amount of matter in the system, which would not change in a sealed environment.

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Q: Would the mass be the same in a sealed cup of water?
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