評論
打印
Well, I have a jar right here and I have
這里有一個容器
in this jar, what does it look like?
容器中看起來是什么
I have a liquid, what does it look like? It looks like...
這是一種液體 像什么 它像…
looks like wate
像水
The way we describe this liquid is to say it's a clear and colorless liquid
這種液體我們將其描述為無色透明液體
which is what water i
水就是這樣的
So I'm going to take this liquid and...
我將用到這種液體
so I want everybody to see the jar right here
我希望所有人都能看到這個容器
Get this out of wa
這個拿開
I'm going to take the dollar bill
我將把這張美鈔
I'm going to soak it in this clear and colorless liquid which looks like water
浸入到這種像水的無色透明液體之中
And I'm going to fish it out using those tongs
我將用坩堝鉗將其撈出
You see it's dripping like any wet object would, right?
和浸入水中的物體一樣 有液體滴下來
And then I'm going to take it to the flam
下面把它放到火焰上
Take a good look at it. Now the joy is maybe the last time you see it
看好了 可能和之前一樣哦
So here is the dollar bill on fire
美鈔燒了起來
Or is it?
真的嗎
But you did see a flame, didn't you?
但你們看到火焰了 不是嗎
So now I ask you
現在我問你們
can this liquid be water?
這種液體可能是水嗎
You know from experience that water does not burn under these condition
根據經驗 你們知道浸水的紙是燒不起來的
So I will tell you what's in this jar
我來告訴你們容器里裝的是什么
This clear and colorless liquid is a mixture of rubbing alcohol and wate
這種無色透明液體是擦拭酒精和水的混合物
isopropyl alcohol and wate
異丙醇和水
You know also from experience
你們從經驗就能知道
that when you burn alcohol, what color of flame do you see?
醇燃燒時 應該看到什么顏色
It's kind of bluish, right?
帶藍色 對吧
Do you remember what color of flame is out here?
記得這里火焰是什么顏色嗎
It was a little yellowish, right?
有些帶黃色 對吧
That's because we also added a little bit of sodium chloride in there
這是因為我們還在這里加了一些氯化鈉
The eye is more sensitive to the yellow color than it is to the blue color
眼睛對黃色更敏感 對藍色則較遲鈍
So we added the sodium chloride to enhance the visibility of what's going o
所以我們加了些氯化鈉 來增強反應的視覺效果
Alright, so what happened there?
好 這里發生了什么呢
Dr. Shakhashiri soaked the money i
Shakhashiri博士將錢浸入到
a solution of water rubbing alcohol and a little bit of table sal
擦拭酒精和少許食鹽的水溶液中
When he puts the money in the flame, the alcohol burn
之后將錢放到火焰中 酒精開始燃燒
producing heat and light, energy
生成熱和光 能量
and carbon dioxide and wate
二氧化碳和水
The reaction is this
反應是這樣的
There's our alcoho
這是酒精
reacting with oxygen
同氧氣反應
producing carbon dioxide, water and energy
生成二氧化碳 水和能量
So why doesn't the bill burn?
那為什么鈔票沒有燒起來呢
If you have a beaker of alcohol and light it on fir
將一燒杯酒精在上方點燃
it's just that very top layer of alcohol and the gas above it that burn
只有最上方那層酒精和上面的氣體會燃起來
the rest of the alcohol in the beaker does not
燒杯中的其它酒精則不會
So that's what's happening with our dollar bil
這里美鈔的情況也是如此
Let's draw a dollar bill right her
這里我畫一張美鈔
So the alcohol --
酒精
ROH could be any alcohol --
ROH可以表示任何的醇
is evaporating off the bill
會從鈔票上蒸發
turning into the gas
變為氣體
and burnin
并燃燒
So those are the flames that you see
這些就是你所看到的火焰
but remember that the solution is 50 percent water
但要知道 溶液中有50%是水
The water is evaporating much less quickly than the alcohol
水的蒸發要比酒精慢很多
staying in the bil
留在鈔票上
and preventing the paper from burning
阻礙紙張燃燒
So that's one way to hold on to your cas
這就是不讓錢燒起來的方法
Hope you enjoyed money to burn, and I'll see you next time
但愿大家喜歡"燒錢"這個演示 我們下次再見
