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#### 音乐火桌

Musical Fire Table!

Just press Play, you mean?

[Voiceover] Yeah, go for it.
[画外音]嗯 开始吧
[Music]
[音乐]
Wow!

[Music]
[音乐]
Now, you may have seen a Ruben’s tube before.

That’s basically a pipe with a bunch of holes in it,

and you pump in a flammable gas,

and light it on fire,

so you basically create a row of Bunsen burners.

What’s really cool is to play some sounds into the tube,

and you can actually set up standing waves.

That is, there are areas,

there are patterns of the vibration of the air

where there’s a lot of vibration in some parts,

and not very much vibration in other parts.

Now, that affects the flow rate of the gas

inside that tube into the atmosphere,

and so it affects the height of those flames.

So basically, you can visualize the standing wave pattern.

I’m currently in Denmark

with a team of physics and chemistry demonstrators

who have taken this experiment to the next level.

They’ve actually created a two-dimensional Ruben’s tube,

a whole plane of Bunsen burners, effectively.

-How many holes in this tube? -2,500
– 上边有多少洞？ – 2500
-2,500 in this Pyro Board? -Yeah.
– 这块火焰板上有2500个？ – 没错
-So we’re gonna see 2,500 little flames. -Yeah.
– 所以一会儿能看见2500簇小火焰 – 是
So, do you want to light it up?

Yes, I really want to light it up.

Why did you make this?

Because, we really liked the Ruben’s tube, but then we thought,

“when you put on more fire, then it always gets better.”
“火焰越多 效果越好”
[Laugh]
[笑]
Let’s just turn down

[Sound]
[声音]
And then we can just try to find the standing wave.

This is below the normal standing wave.

[Sound]
[声音]
See that? It’s really difficult to see that.

So what are we seeing here?

It’s pretty much like the standing wave on the Ruben’s tube.

It’s just in this direction.

This is the lowest frequency

that makes a standing wave in this pulse.

So this is like the fundamental.

It’s the fundamental.

Can you show me what happens when you vary the volume a little bit?

Whoa! That was awesome.

Okay, should we try to find another standing wave?

Yes.

You can see it.

You can hear it before you can see it.

Woah

It’s weird. With the microphones, I can actually hear,

like here, I’m in a node,

and then here, I’m in an anti-node. Here I’m in a node.

Because you can measure the sound pressure?

I can hear it.

Like here is very much an anti-node.

-This is a node, and you guys can hear it. -That’s true.
–这是一个波节 你们能听见 –确实
It’s incredible. The flames must be coming out in the anti-nodes.

The flames are coming up in the anti-nodes, yeah.

You can even hear it.

-Yeah It’s nice that it can do that. -That’s incredible
–做到这些感觉很好 –好神奇

-That is awesome. -We just learned something.
– 太酷了 – 我们也学到了点东西
What happens if we try to go higher frequency?

Yeah. We have something. Oh, that’s a good one.

That is crazy. We’re right in the anti-node.

Oh, God!

My ears are hurting now.

That was painful.

Why don’t we try to put something more pleasing to the ear

through the speaker and see what happens.

I think that’s a good idea.

– Let’s put some music on there. You ready? – Go.
–让我们放起音乐吧 准备好了吗 –来吧
[Music with bass thumping]
[有着低沉贝斯声响的音乐声]
So, you go around Denmark showing kids all about physics?

We do. That’s what we do.

You show them the Pyro Board?

We show them the Pyro Board, and we show them a whole lot of other stuff.

– And you guys are also on YouTube? – Yep, we have a YouTube channel.
–你们在油管上有频道吗？ –我们有
You can go to this link, right here.

Go check it out if you want to see more of what these guys are up to.

– It’s awesome. – It’s great.
–非常精彩 –不错
Ahoy. That is the actual Czech word for hello.
Ahoy 这是捷克语中你好的意思
I have made it to Olomouc in the Czech Republic,

and this is partly thanks to support from Audible.com,

the leading provider of audio books,

with over 150,000 titles in all areas of literature,

including fiction, non-fiction, and periodicals.

And today, I wanted to recommend a book, which is a little bit European,

and it’s called Galileo’s Daughter by Dava Sobel.
《伽利略的女儿》作者是达娃·索贝尔
I love this book because it includes the actual letters

written from Galileo’s daughter to him during his life,

and it really reveals what he must have gone through as a human being.

the trials that he went through,

but to see this kind of insight into his personal life,

I think is remarkable, so you should really check out this book,

or you can pick any other book of your choosing for a one month free trial.

So I really want to thank Audible for supporting me,

and allowing me to go and meet great scientists,

and filmmakers, and lots of people all around the world.

Also, I should note that I will be hosting Michio Kaku

in Brisbane and Melbourne on June 5th and 6th.

Links in the doobly-doo. I would love to see you there.

Thank you so much for watching,

and I will see you somewhere else in the world.

Bye.