[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:07.81,Default,,0000,0000,0000,,Hi, I'm Brady and you might remember last year the professor met a man named Max Whitby the element collector.
Dialogue: 0,0:00:07.81,0:00:12.08,Default,,0000,0000,0000,,He's a guy who makes real life periodic tables
Dialogue: 0,0:00:12.08,0:00:15.34,Default,,0000,0000,0000,,and we remember what Max told us.
Dialogue: 0,0:00:15.34,0:00:17.71,Default,,0000,0000,0000,,I'll invite you to our lab to see some being melted
Dialogue: 0,0:00:17.71,0:00:20.17,Default,,0000,0000,0000,,which is quite a nice thing to see.
Dialogue: 0,0:00:20.17,0:00:22.98,Default,,0000,0000,0000,,So I've been down to London to make a few videos with Max
Dialogue: 0,0:00:22.98,0:00:25.83,Default,,0000,0000,0000,,and well, here's the first one.
Dialogue: 0,0:00:29.53,0:00:37.17,Default,,0000,0000,0000,,We're in the world headquarters of the red, green, and blue company, RGB research, which is where we make our periodic tables.
Dialogue: 0,0:00:37.17,0:00:46.38,Default,,0000,0000,0000,,The displays that we make here are really mainly for museums and for schools and occasionally for very wealthy individuals who fancy a periodic table in their study.
Dialogue: 0,0:00:46.50,0:00:52.72,Default,,0000,0000,0000,,And actually what I'm about to do now is to make a sample to go into one of these periodic tables
Dialogue: 0,0:00:53.00,0:00:54.42,Default,,0000,0000,0000,,This is what we're starting with
Dialogue: 0,0:00:54.42,0:00:59.22,Default,,0000,0000,0000,,and it's, um, a beautiful one kilogram jar of silver.
Dialogue: 0,0:00:59.44,0:01:03.93,Default,,0000,0000,0000,,Sadly, if I bought this about a year ago I could have got it for maybe 200 pounds.
Dialogue: 0,0:01:03.93,0:01:06.87,Default,,0000,0000,0000,,But now silver shot up in price.
Dialogue: 0,0:01:06.87,0:01:15.21,Default,,0000,0000,0000,,This is one of the terrible problems of being in the element selling trade. And now this is almost a thousand pounds worth of silver.
Dialogue: 0,0:01:15.21,0:01:21.42,Default,,0000,0000,0000,,And what I'm going to do, I hope, is to turn it into a beautiful cylinder.
Dialogue: 0,0:01:21.42,0:01:26.33,Default,,0000,0000,0000,,This is even more expensive. Feel the weight, just feel the weight of that.
Dialogue: 0,0:01:26.34,0:01:28.69,Default,,0000,0000,0000,,(man off screen) whoa yea, what's that?
Dialogue: 0,0:01:28.69,0:01:33.51,Default,,0000,0000,0000,,Yea, well, what you're looking at is pure gold. So that's a one kilogram cylinder.
Dialogue: 0,0:01:33.51,0:01:41.64,Default,,0000,0000,0000,,Um, and, um, if we make an equivalent size cylinder in silver it's going to be about half the weight. It's going to be about half a kilogram.
Dialogue: 0,0:01:42.08,0:01:44.52,Default,,0000,0000,0000,,Um, so I'm hoping to get two cylinders out of this.
Dialogue: 0,0:01:44.81,0:01:49.17,Default,,0000,0000,0000,,Now, the very first step in making a cylinder - do you know what it is?
Dialogue: 0,0:01:49.34,0:01:51.77,Default,,0000,0000,0000,,You have to do a risk assessment,
Dialogue: 0,0:01:51.77,0:01:55.32,Default,,0000,0000,0000,,cuz what we're doing is dealing with hot molten metal.
Dialogue: 0,0:01:55.32,0:02:00.68,Default,,0000,0000,0000,,And so, um, we've actually gone through quite carefully, thinking of all the things that can go wrong
Dialogue: 0,0:02:00.68,0:02:03.66,Default,,0000,0000,0000,,and, Brady, we've actually had a chat about that.
Dialogue: 0,0:02:03.71,0:02:06.04,Default,,0000,0000,0000,,That's why I'm going to be standing out here.
Dialogue: 0,0:02:06.04,0:02:09.96,Default,,0000,0000,0000,,And, um, I'm going to load the furnace. See that's glowing nicely red-hot?
Dialogue: 0,0:02:09.99,0:02:13.57,Default,,0000,0000,0000,,This is a graphite crucible. In fact, stay there and I'm going to go and turn the light out.
Dialogue: 0,0:02:17.02,0:02:18.26,Default,,0000,0000,0000,,Is that glowing still?
Dialogue: 0,0:02:18.37,0:02:19.12,Default,,0000,0000,0000,,man off screen - yea
Dialogue: 0,0:02:19.57,0:02:26.67,Default,,0000,0000,0000,,Yea so that is hot. I've set that to one thousand and fifty degrees Centigrade, so that's quite a bit above the melting point of silver.
Dialogue: 0,0:02:27.51,0:02:36.22,Default,,0000,0000,0000,,Um, so I'm going to start by filling that up. And now, of course, doing this is going to reduce the temperature, uh, very considerably.
Dialogue: 0,0:02:36.22,0:02:47.16,Default,,0000,0000,0000,,Um, so, once we've filled it up with the pieces of silver, well then you can actually see it cooling. And silver is a superb conductor of heat.
Dialogue: 0,0:02:47.26,0:02:52.73,Default,,0000,0000,0000,,And that's got a lot of thermal inertia. You can see that's gone almost now back to the color of graphite.
Dialogue: 0,0:02:52.73,0:02:56.42,Default,,0000,0000,0000,,Cause all that heat that was in the graphite has gone into the silver very very quickly. Superb conductor.
Dialogue: 0,0:02:56.42,0:03:01.36,Default,,0000,0000,0000,,And now we're going to close the little lid and leave it to, leave it to cook.
Dialogue: 0,0:03:01.98,0:03:04.64,Default,,0000,0000,0000,,So (whooooo)
Dialogue: 0,0:03:12.94,0:03:18.79,Default,,0000,0000,0000,,And well, this is, uh, slightly overkill but it provides a full face mask.
Dialogue: 0,0:03:18.80,0:03:23.11,Default,,0000,0000,0000,,Gloves again, and, uh, fingers crossed!
Dialogue: 0,0:03:37.01,0:03:38.80,Default,,0000,0000,0000,,Fantastic!
Dialogue: 0,0:03:40.42,0:03:43.24,Default,,0000,0000,0000,,Now that's a sink hole appearing
Dialogue: 0,0:03:51.82,0:03:53.25,Default,,0000,0000,0000,,Hopefully that will fill up the sink hole.
Dialogue: 0,0:04:04.40,0:04:07.99,Default,,0000,0000,0000,,Um, ok. Well I'm very relieved. That seems to have come out ok.
Dialogue: 0,0:04:07.99,0:04:11.55,Default,,0000,0000,0000,,It's a bit like making jelly, only a thousand degrees Celsius more.
Dialogue: 0,0:04:12.57,0:04:15.51,Default,,0000,0000,0000,,Now what's going to happen is that's gonna cool down.
Dialogue: 0,0:04:15.51,0:04:27.38,Default,,0000,0000,0000,,And then we'll take it to our marvelous engineer, Davey Brotnell, and he will machine it down to a beautiful cylinder 55 mm long and 35 mm in diameter.
Dialogue: 0,0:04:27.38,0:04:31.66,Default,,0000,0000,0000,,And then it will go to America to a periodic table.