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Something not everyone takes into account is that every molecule has a weight, even the molecules that make up air. It may not be noticeable, but it's definitely present.

So if by "empty tank" you mean "a tank containing no molecules", and it were compared to a tank filled with air, or "a tank containing at least one molecule", then you can see that a tank filled with air will weigh more than an empty tank (although the difference may be very very small).

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15y ago
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Q: Does an empty tank weigh the same as the tank filled with air?
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