Nature loathe a vacuum , or so the saying goes , and you may use that to your advantage when it comes tobuilding a elephantine board - sized cannon that can obliterate a watermelonwithout the need for dangerous explosive or press air tanks .
Submarines diving to the deep parts of the ocean need to be built incredibly potent to survive the uttermost pressure of all that water . The air in the solid ground ’s atm does the same thing — you just do n’t really feel the pressure because you ’ve been exist your whole life exposed to it . But break the seal on the end of a ten - foot plastic metro with a vacuum inside , and that atmospheric pressure will send air rush in so tight it can send a projectile hurdle out the other ending at close to the f number of sound .
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Cannons
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