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食物有磁性吗?

Is Our Food Magnetic?

Hi I am Jared, welcome to Fun Science Demos.
大家好 我是Jared 欢迎来到《趣味科学实验室》
Do you know a great way to start your day
你们知道吗?开始一天的好方法
is with a nice healthy breakfast?
是吃一顿健康的早餐
At Fun Science Demos, we like to say that there is science everywhere.
在《趣味科学实验室》 我们会发现科学无处不在
You just have to sometimes take the time
也许有时候 只需多点耐心
to stop and try and wonder why
停下来尝试 并思考原因
and we can even find science in our cereal.
我们甚至会发现 麦片里也有科学
Our body is made of cells
我们的身体由细胞构成
and those cells need certain things to work
这些细胞需要某些物质才能“工作”
things like vitamins and minerals
比如维他命和矿物质
so where do we get all those vitamins and minerals
那么 我们从哪儿得到细胞工作
that our cells need to work?
所需的所有维生素和矿物质呢?
Well we get those vitamins and minerals from our food
我们可以从食物中获取维生素和矿物质
from this bowl of cereal.
例如从这碗麦片中
We are going to use science
我们将用科学的方法
to take a closer look at one of the most important minerals
仔细看看我们在体内发现的
that we find in our bodies: iron.
最重要的矿物质之一:铁元素
to take a closer look at the iron that we can find in our cereal.
为了能看清谷物中的铁
We are going to need some really strong magnets
我们需要某些强吸力的磁铁
Why magnets?
为什么是磁铁呢?
Because magnets do something really neat
因为磁铁靠近含铁物体时
when it gets close to iron
会产生强吸引力
the magnets attract the iron.
磁铁可以吸引铁
And if magnets can attract the iron we find in the spoon
如果磁铁能吸引勺子中的铁
I wonder if we can use the same magnets
我想知道 我们是否可以用同样的磁铁
to attract the iron we find in our food.
来吸引食物中所含的铁
So we have zoomed in on our nutrition label
首先我们给配料表一个特写
and if you look closely
如果你们仔细看
right above my finger you should be able to see iron
就会发现我手指上方 写着“含铁”
And if I look even closer
如果再近一点
it says that eating a bowl of this cereal
会发现它写着 吃一碗这种麦片
will give my body one hundred percent of the iron
就可以提供给我的身体
that it needs each day
一天所需的铁元素
There is definitely iron in this cereal!
这种麦片确实含铁!
Now there is a lot of iron in this spoon
铁勺含铁够多
so the magnet can attract it without any problem
毫无疑问可以被磁铁吸住
but there is not as much iron in each flake of my cereal.
但是我的麦片含铁没有那么多
So how can we get to see them
所以我们如何能看到
the magnet and the iron at work ?
磁铁起作用呢?
Well we need to get creative.
我们需要开动脑筋
So we brought in a really big bowl for our cereal
首先我们拿来了一个非常大的碗
and we do not need a whole bowl of cereal
我们不需要一整碗麦片
we just need one piece, and we filled our bowl with water.
只需一片 然后放进盛满水的大碗里
What we are going to try to do
然后我们尝试
is float one piece of our cereal on the water
让麦片漂在水面上
and put the magnet close to our cereal
再慢慢把磁铁靠近麦片
and see if we see something happen.
来看看是否会发生些什么
We are going to zoom in so you can get a better look.
给个特写 这样你们就能看得更清楚
So we have zoomed it and now we are ready to see
现在已经特写了 让我们来见证
science at work in our cereal.
麦片里的小科学吧
Let us float our cereal enter the magnets
让麦片在水面漂着 然后用强磁铁吸引它
let’s get them close
把磁铁靠近些
and can you see what’s happening?
你能看到发生什么了吗?
I can use the magnets
我可以用磁铁
to pull the cereal all across my bowl
吸引麦片漂过这个碗
but it’s…what’s happening there?
但 这是什么原因呢?
Well the iron in the cereal
因为麦片里的铁
is attracted to my really strong magnets
对我的磁铁也产生吸引力
and man, I can see the magnets
朋友们 可以看到磁铁
pulling the iron in the cereal.
在吸引麦片中的铁
All you need to do is take a walk down the breakfast cereal aisle in your food store
其实你只需要找到商店里卖谷物麦片的货架
and take a closer look at some of the nutrition labels
仔细看看一些麦片
of all the different types of cereals.
的营养成分标签
This type of cereal actually has 40 percent iron
事实上 这种麦片含铁40%
but this one right here has 90 percent iron.
但这个含铁量高达90%
It is really neat to just grab a box of cereal
你只需要买一盒麦片
get some water in a really strong magnet
一碗水 一块强力磁铁
and try it out for yourself.
自己尝试一下
Experiment and see what happens!
做个小实验看看吧
See if you can get the iron in the cereal
观察你麦片里的铁
to be attracted to the magnet
能否被磁铁吸引
but think about this too.
你有没有想过
Other foods besides breakfast cereal
除了早餐麦片
have iron in them too.
其他食物也含铁
I wonder if we could actually use a magnet
我想我们也可以用磁铁
with some of those other foods
来测试一些其他的食物
and see if we can get the iron to attract to the magnet.
看看我们能否用磁铁吸引其中的铁
Let us give it a try.
我们来试试吧
A simple Google search will tell you
我们先谷歌搜索
what types of food have a lot of iron in them.
哪些食物富含铁
Spinach is one of those foods that has a lot of iron in it.
菠菜就是一种含铁丰富的食物
I wonder if I could float this spinach leaf
我想可以让菠菜叶浮于水面
and see if the iron in the spinach
看看菠菜叶中的铁
could be attracted to the magnet.
能否被吸引
To do that I am going to break off the stem
先摘掉叶茎
and I am going to drop it in my bowl
然后把叶子放进我的碗
and we will zoom in and take a closer look
我们给个特写
and see what happens.
仔细看看发生了什么
Let us drop in our spinach leaf
把菠菜叶子放在水面
let us put our magnet next to it and see
强磁铁放在它旁边
if something happens.
看看会发生什么
You will notice
你会注意到
that spinach leaf is following my magnet
叶子在跟着磁铁走
because the iron in that leaf
因为叶子里的铁
is attracted to the magnet.
被磁铁吸引了
Absolutely amazing!
太神奇了!
Pumpkin seeds also have some iron in them
南瓜籽也含铁
so let us see if we can get the iron on our pumpkin seed
我们来看看南瓜籽中的铁
to attract to our magnet
能否被磁铁吸引
let’s float it in the water.
把南瓜籽放水里
Let us get our magnet close to it.
把磁铁靠近它
Sometimes we got to get really close
有时候我们要离近一点
and now I got it moving.
南瓜籽动起来了
The iron in the pumpkin seed is attracted to my magnet.
南瓜籽里的铁也被磁铁吸引了
Absolutely cool!
太酷了
Remember, scientists like to try things in experiments
科学家喜欢在实验中尝试
so I took a field trip to my food store
于是我来到食品店
and I looked at some of the nutrition labels
仔细看了这些食物的
on all of these foods
一些营养标签
and I found that iron is actually in cocoa powder
我发现其实 可可粉
and seaweed and chickpeas and oats.
海草 鹰嘴豆和燕麦片中都含有铁
I wonder if you could experiment
所以我觉得或许你们也能实验一下
if you could become a scientist
当个科学家
get some really strong magnets, a bowl of water
找一个强力磁铁 一碗水
and see if you could get the iron in these foods
看看这些食物中的铁
to be attracted to this magnet.
能否被磁铁吸引
If you want to learn more about magnets and how cells work
如果想了解更多磁力学和细胞运作的知识
check out our links in the video description.
请点击视频里的链接了解
Science is so cool
科学很酷
especially when we find it in our food!
尤其是当我们在食物中发现它们的时候
Thanks for watching!
谢谢观看!

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视频概述

你想“看到”食物中的铁吗?让我们来做个酷酷的小实验吧!

听录译者

收集自网络

翻译译者

Jeanine

审核员

审核员 V

视频来源

https://www.youtube.com/watch?v=tKdWhxTlJCU

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