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2

As stated above, the mass of the whole system (sugar + water) doesn't change. In addition, with "ideal" mixing, the total volume of the water plus the total volume of the sugar equals the total volume of the mixture. However, this is not a sure bet, and there are many cases of a volume of one material mixed with a different volume of water, and the total ...

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The conventional method of nuclear waste disposal is just fine. Just bury it deep into some geologically inactive rock. Consider this: If you dig a deep hole into ground in some geologically inactive area, you will find rocks and minerals that have been there for millions of years. If you put your nuclear waste there, there is no reason why it wouldn't ...

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The mass doesn't change at all, it will be just the sum of the water mass and the mass Added, what happens is the change of density because the mixture, in general the molecules get closer to each other ( through the intermolecular forces) and, this way, the volume become lower to the same mass quantity, what increase the density by the equation  \rho = ...

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