首页>英语角 > 听力 > 美音 > 课 程 > 社会 > 高二>How To Make Bouncing Putty
How To Make Bouncing Putty
Question
The borax binds the ______________ together.
提交
00:00
00:00
Right, now I'm going to show you how to make bouncy putty. Again, it's very simple. We've got some black food coloring. I've chosen black, it can be any color, really makes no difference at all. We're going to be using some PVA glue, just standard PVA glue that anyone would have at home or school. We need something to mix with so we're going to be using a lolly stick tip and we will also be using borax. This is borax powder. It's available in most chemists and this, we mix with water which I've done already and I've put it in my bottle here. So, the first thing we need to do, we're going to color the glue with a black food coloring. So, we just need to put a little bit in here. If you want to make grey, you would just put a few drops. Let's make a really nice dark color though. So we give that a mix. Make sure all the white has disappeared. Wow, we've got a lovely black color there. Now, what we have to do is just to add the borax. So, here we are, here is our borax. Now, inside of the PVA glue are polymers and the borax helps to bind these polymers together. And as you can already see, these polymers are binding together to create a putty. It needs to be stirred for a few minutes and you'll know that it's ready when all of the liquid has been absorbed into the putty and all you're left with is a solid lump of what you can see. You need to give it quite a good stir to make sure. If you would have poured it, it'll take you forever together. As you can see though, the consistency is changing and you can see all the liquid starting to be absorbed. Ideally, you'll get to the point where there's nothing on the sides of the cup or very little and it has that kind of consistency. It almost resembles a fresh piece of coal or something like that, gets really quite stiff and fairly brittle in fact strangely. Now, to make a good bouncing effect, we need a good shape. I'm going to try get it into a nice ball. Oh, bouncy if unpredictable putty. .
视频文本已隐藏,本文本来自网络或网友仅供参考
显示视频文本

Discuss

0 comments
characters remainingSubmit
反馈