Brainiac Alkali Metals

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Is this the same guy from Top Gear?

hoooooly shit. this is awesome :)

but so fun to watch!

I would guess that they probably used a stick of dynamite or a small lump of C-4 or something along those lines to blow up the bathtubs. It is physically impossible to get that size explosion from 2 grams of cesium. Even 2 grams the theoretically more reactive francium would not cause that explosion. You would never get 2 grams of Fr to toss in a tub because Fr is an extremely rare radioactive element. Also, the water would be very dangerous to handle after the experiment due to radioactivity.

for fun i actually calculated the force of a 2 gram explosion assuming all reacts, its 3.5 newtons, if that can blow up a bath tube i would hate to see what would happen under the force of gravity were someone to stand in it

sorry, i am an idiot, i missed talking into account the mass of water formed, the force is 63 newtons, not 3.5, i knew i wasn't right when i posted, lesson learned review your math carefully lol, but sill, 63 newtons will make a nice pop, but it wouldn't blow up a bathtub

2 grams of cesium produces .015 grams of hydrogen, which is the exploding component of the reaction, .015 grams of hydrogen exploding completely would release only 4.26KJ which is not even a fraction of the force needed to crack a bath tube, and this is making the assumption that all the cesium reacts and all the hydrogen is combusted, which are not reasonable assumptions, the real values would be even lower than this, probably somewhere in the neighborhood of 50%

Two grams of cesium won't cause the explosion in the video. The reaction while violent does not realease enough energy to blow apart a bathtub. What causes the explosion when alkali metals are combined with water is the rapid combustion of hydrogen gas generated by the reaction, ignited by the heat the reaction generates. The force is inherently limited by the amount of hydrogen generated and 2 grams of cesium will not produce enough hydrogen to create an explosion large enough to destroy a tub.

yeah, its completely faked, if the cesium managed to react completely before the explosion only .015 grams of hydrogen would be evolved, that is not even close to the amount needed for this type of explosion, you would need a couple moles to approach the level of the explosion shown in this video