How to make bottle rockets with liquid nitrogen and water

This guy builds rockets with bottles and water , adding liquified N , turning them upside down and thunder , instant actuation : The nitrogen expands very tight on top of the fond water supply , turning violently into accelerator pedal , and pushing the bottle up .

https://www.youtube.com/watch?v=43vvwB9GNcA

And in case you interest about how he ’s manage liquid nitrogen — I did too — apparentlyit ’s not that dangerous thanks to the Leidenfrost consequence , which creates an insulating layer of gas as presently as the liquid atomic number 7 drops touch his warm skin . As long as he does n’t deluge his hand , he ’s dependable . Ish .