Hi, I'm Jessica
嗨，我是Jessica
Today I'm gonna talk to you about a chemical demonstration I like to call
今天我要讲的化学演示叫作
colorful indicators
多彩指示剂
Indicators show us what we normally wouldn't be able to see
指示剂/物能够指示出我们一般看不到的情况
from the canary in the coal mine
包括煤矿地中的金丝雀
to a paint that changes color with temperature
随温度改变颜色的颜料
to the acid-base indicators we'll be seeing today
以及今天我们要看的酸碱指示剂
And chemist Dr. Bassam Shakhashiri
化学家Bassam Shakhashiri博士
here he is
这就是他了
is going to be showing us the demo
他将为我们进行演示
He's the president of the American Chemical Society
他是美国化学学会主席
and performing this demo right here at MIT
演示是在MIT这里进行的
You know, what I'm going to do is an experiment
下面我要做的实验
using another form of carbon dioxide that's called dry ice
将用到另一种形式的二氧化碳，叫作干冰
Dry ice is solid carbon dioxide
干冰是固态二氧化碳
and you'll notice I'm putting what on?
看这里我戴上了什么
Putting gloves
带上手套
And I'm going to open this bucket and pick up 3 chunks of carbon dioxide
我将打开这个桶，并取出三块二氧化碳
Solid, this a solid carbon dioxide
这是固态二氧化碳
Its temperature is -78 degrees Celsius
其温度是-78摄氏度
It's very cold
非常冰冷
Dry ice changes from being solid to a gas by a process we call...
干冰从固态变为气态的过程叫作…
sublimation
升华
Sublimation is happening right now but we can't see it
升华正在发生，但我们看不到
how come we can't see it?
为什么看不到呢
Because carbon dioxide is gas. It's what?
因为二氧化碳是气体，它是怎样的
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