Talk:Israeli Navy/@comment-24301892-20150506162359/@comment-27797576-20150506164854

Umm, you do realize liquid nitrogen would still work, right? Maybe not for continous fire at max power, but it'd still operate just as well.

Mach 20 would cause degradion of the bullet at that speed in the atmosphere, even with a pure tungsten round. The atmosphere puts physical limits on what can be done with weaponery. It's the reason why coilguns can typically only go mach 5 or lower, and railguns Mach 10.

And how would you know the Mk-5 rail could do that without finishing the tech in the first place? While you may be able to caclulate it, typically those caculations are optimistic, and perform worse than stated from the scientists.