I am curious to know if anyone knows if the following experiment has ever been conducted? If not, can anyone theorise what the result may be? 2 flasks A,B are of equal size. Flask A contains a vacuum. Flask B is entirely full of mercury, with no air present. To ensure that the effect of external air pressure has no influence on the experiment,both flasks A and B are contained within a third larger flask C, which itself contains a vacuum.(Apart from the presence of the flasks within obviously). A valve is opened between flasks A and B. Does the mercury in B flow into A? If so, it can be assumed that the consequential vacuum(ous) space so created in flask B, will necessarily always be 'harder' than that contained in flask A, therefore preventing the possibility that the mercury levels in both flasks will equalise. Alternatively, does the mercury simply remain in flask B? If so, this contradicts the statement that 'nature abhors a vacuum, does it not?