Highlight text to annotate itX
Greg Foot: Hey guys, this is the third explanation video for the 12 Explosions of Christmas.
I'm Greg - Mike Sansom: and I'm Mike!
Greg: and this is three crackers cracking. And oh boy isn't this gonna be a whopping
crack! Mike: It really is. We're using something
completely different to what we've seen already. We've seen black powder, we've seen flash
powder, which are all low explosives. This one, we've got high explosives.
Greg: Oh yeah, so a low explosive what happens is you burn and it burns the bit next to it
and the bit next to that and the bit next to that and it slowly propagates. This is
more of a detonation, so you detonate it and all the bonds break a part and the chemical
reaction happens afterwards. Mike: That's right, it's completely different
to a low explosive. Greg: So rather than being a mixture, what
is it? Mike: That's it, rather than being a composition
of different chemicals where they burn, this is one chemical and it detonates. So it's
a breaking a part of the bonds inside on a molecular level.
Greg: And we have to be a long way away from this. There's no lighting a fuse and running
off. This is a long way, remotely fired, we're gonna be right at the other end of the field,
a good what? 100, 200 metres? Mike: Even 300 metres.
Greg: So, we're gonna get this all sorted, and yeah enjoy!
Mike: OK, we're on, we're ready to go. Greg: OK, here we go!
Mike: Right, OK, ready? 3, 2, 1 Greg: That was three crackers cracking!
Mike: I think that cracked quite well! Greg: I think they would have heard that for
miles! Mike: I think so yeah!
Greg: Wow, right, two left! Mike: I think I might have put a bit too much
aluminium powder in that one...
here are our four flaming puds, not yet flaming! Now they may look like they've got special
toppings on them from pistachio to chocolate to icing sugar. But these are kinda inedible.
Mike: Yep they're completely inedible. Greg: What have they got on them?
Mike: Well they've got different metal salts on them with something that burns. Hopefully
we're going to produce a different colour on each pud. This one we've got strontium
-- Greg: Yeah strontium, barium that's the particularly
nasty one, copper, and sodium. This is all about giving energy to those metal ions, those
metal atoms, and exciting the electrons inside them, and then those electrons drop back down
again to their original energy level, and they spit out a different, essentially, light
photon. So you get different colours from the different metal salts. Right?
Mike: Shall we try it? Greg: Let's do it!