You will hear a conversation between two students discussing the design and structure of a Coca-Cola can for a presentation. Now listen carefully and answer the questions. That's an enormous number. It says here, outstrips the production of nails or paper clips. And they say that the manufacturers of these cans exercise as much attention and precision in producing them as aircraft manufacturers do when they make the wing of an aircraft. Really? Let's have a look. They're trying to produce the perfect can, as thin but as strong as possible. This bit's interesting. Today's can weighs about 0.48 ounces, thinner than two pieces of paper. From this magazine, say. Yeah, and yet it can take a lot of weight. More than 90 pounds of pressure per square inch. Three times the pressure of a car tyre. OK, I agree. It's a good topic. What I thought was that we could do a large picture of a Coke can and label it and then talk about the different parts. Look, I've done a rough picture here. OK, so where shall we start? Well, the lid is complicated. Let's start with the body first. I'll do a line from the centre of the can. like this, and label it body. What does it say? It's made of aluminium, of course. It's thicker at the bottom. Right, so that it can take all the pressure. And then I think you should draw another line from the body for the label. Right, label. The aluminium is ironed out until it's so thin that it produces... what does it say? A reflective surface suitable for decoration. That's right, apparently. It helps advertisers too. Yes, because it's attractively decorated. Good. And then there's the base. Yes. It says the bottom of the can is shaped like a dome, so that it can resist the internal pressure. That's interesting. I didn't know that. Nor did I. OK, so going up to the lid, there are several things we can label here. There's the rim around the edge which seals the can. Got that? And there's a funny word for the seal, isn't there? Yes, it's a flange. What does it say about it? Well, the can's filled with coke, or whatever. And after that, the top of the can is trimmed and then bent over to secure the lid. That's right. It looks like a seam. We could even do a blow-up of it, like this. F-L-A-N-G-E. Yes, that would be clearer. I think we should label the lid itself and say that it constitutes 25% of the total weight. 25%, so it's stronger than the body of the can. So, to save money, the manufacturers make it smaller than the rest of the can. Didn't know that either. So how do we open a can of Coke? First of all, there's the tab, which we pull up to open the can, and that's held in place by a rivet. I think that's too small for us to include. I agree, but we can talk about it in the presentation. We can show the opening, though. That's the bit of the can that drops down into a drink when we pull the tab. Yeah, hopefully. Sometimes the tab just breaks off. I know. Anyway, the opening is scored so that it pushes in easily.