儿童科普do you know 英文字文本Fizzy Water and yoghurt S1E3

儿童科普do you know英文字文本 Fizzy Water and

yoghurtSlE3SI.003 Fizzy Water and yoghurt

Hello, Km Maddie. And today, Km going out for a nice long walk.

I don't know about you, but when I go on a long walk, I like to take a few

things with me.

What do you take?

I've got some snacks in here.

A juicy apple and a drink.

Fizzy water （气泡水）.It/s one of my favourites.

PFFT!

Oh! I love that sound.

And did you see how all the bubbles rose to the top when I opened the

bottle? But how do the bubbles get int the water?

Do you know how fizzy water works?

Let's find out.

How does it work?

Fizzy WaterTo show you how fizzy water is made, I've come to a fizzy water

factory where they produce around two million bottles of water every day.

The water is stored inside these tanks before it goes into the factory to get

its bubbles.

out as milk that came from a cow.

Thank you, cows!

And, now you know how the bubbles get into fizzy water.

I'll see you next time.

But where does the water come from?

The water is come from this spring, where rainwater has collected

underground for thousands of years.

It bubbles up to the surface and it sent through pipes into the factory.

And it/s sent to something called the chiller （制冷机）.

The chiller cools down the water so that it's nice and cold before it gets put

into bottles.

But the water inside the ch川eHooks like this.

It's still, which means it doesn't have any bubbles.

It's not fizzy like this one.

So how does still water become fizzy water?

It's time for some bubbles!

The still water is made fizzy by these two tanks.

This tank is called a carbonation tank （碳化槽）.

It makes the water fizzy by pushing a gas called carbon dioxide （二氧化

碳）into the water.

Here's how it works.

Water contains a gas called oxygen.

To make the water fizzy, we need to remove the oxygen.

Inside the tank is a metal plate with holes in it, like a sieve （筛子、过滤

器）.

The holes are so small that, as the water squeezes through them, the

oxygen gas escapes.

And it's taken away through a vent （漏孑L） at top of the tank.

Bye- bye, oxygen!

Now the oxygen is removed, we can make the water fizzy.

The water, with no oxygen in it, is sent to the second big tank.

Here, carbon dioxide gas is pushed into the water very, very fast.

As more and more carbon dioxide bubbles fill the tank of water, pressure

builds up.

This makes the bubbles dissolve into the water so that we can't see them

any more.

And now the water is fizzy.

The pressure is like a balloon ready to burst, and it stays like this as the water

is put into bottles.

We only see the bubbles again when the bottle is opened.

The pressure is released, we hear a big fizzing sound, and the bubbles rush

to the surface.

Clever, isn't it?

Let's use my special camera to get a closer look at the carbonation tanks.

So, the cold, still water comes in from the chiller, through the pipe, and into

this first tank.

And inside here, all of the oxygen is sieved out.

And then it goes into this second tank, and the second tank the water gets

its bubbles.

The carbon dioxide goes in through this pipe just here, and it's squeezed

and squeezed into the water until all of the bubbles dissolve, and then,

when it's fizzy, goes through this pipe, off to get put into bottles.

And this is where the bottles are filled with water.

Look how fast the bottles fill up with the water!

So this is a finished bottle of fizzy water.

I can't see any bubbles, can you? Shall we let the bubbles out?

Oh! Ha-ha! 'Did you hear that? Let's hear it again/What a brilliant hissing

sound.

As I undid the lid all of the gas was released, and they bubbled up to the

top.

Let's use my special camera to slow things down and watch it again.

This camera films in slow motion, which means that when I open the

bottle, the bubbles of gas will be released and we can see it happening

really slowly.

So, let's press record.

Are you ready?

Can you see there are no bubbles until I open the bottle.

And then thousands of tiny bubbles rush to the surface.

Now THAT was brilliant.

All of those little bubbles, you can still see them, those bubbles of carbon

dioxide gas were just waiting to be released, and as soon as I undid the lid,

they certainly were!

They're still going!

What was your favourite bit about seeing how fizzy water works?

Do you remember the name of the gas that makes the water fizzy?

That's right- it's called carbon dioxide.

Did you hear the sound the bottle made when I opened it?

PFFFFT!

Oh! Ha-ha!

And did you see the way the bubbles go up inside the bottle when I used

my special camera?

So, the next time you have some fizzy water, you/ll know how the bubbles

got inside and how they stay hidden until you open the bottle. Now, it's

time for a snack. Ooh I could have a yoghurt.

Yum. Strawberry yoghurt.

I like yoghurt. Do you?

But, do you know how yoghurt is made?

Where does yoghurt come from?

Let's find out.

How is it made?

YoghurtThe first thing we need to make our yoghurt are just in here.

Lots and lots of cows.

All yoghurt is made from milk, but the yoghurt we're going to being made

today comes from cow's milk.

So, to see yoghurt being made, first, we need some milk.

All these cows are about to be milked, which means their milk is collected

from their udders.

And you can see their udders underneath the cows.

Can you see Rich, the herdsman （牧人）?

He's attaching a special pipe to the cows' udders.

This is called a cluster （吸奶器）,and it gently sucks the milk from the

cows udders and takes it down this pipe to this plastic tub called a milk

meter, which measures the amount of milk the cow produces.

And once they're finished milking, the clusters just fall off and the cows

head back to the barn.

Mooooo!

In one day, a single cow can make 21 pints of milk.

That's 21 of these.

That's enough for 70 bowls of cereal.

But how does milk turn into yoghurt?

Once the milk has been collected, it's taken to the factory in a lorry and

stored in huge tanks called milk silos （奶仓）.

The milk is then taken from the silos into the factory to be made

intoyoghurt.

The first stage is for all the ingredients to get mixed together.

And that happens here, in the mixing room.

Yoghurt is made from milk, cream, some milk powder, and a bit of sugar.

And once thy're mixed together, they get sent on to the next part of the

factory.

The next stage happens in here, and it's very noisy.

MACHINES WHOOSH AND WHIRLook at all those pipes.

All the ingredients that have now been mixed together are heated up.

This called pasteurisation （巴氏杀菌法）,and it gets rid of any bad bacteria

that could be in the milk.

Once it's reached the right temperature, the pasteurised mixture is moved

into one of these.

They're called incubation tanks （发酵容器）,and they are huge.

Now a special ingredient is added.

And it will turn the milky mixture into yoghurt.

The special ingredient is called a starter culture （发酵齐, and it's made of

a mix of good bacteria.

Bacteria has to be kept in the freezer; because as soon as it gets warm and

is put in the incubator （恒温箱）,it starts to multiply.

The starter culture is added to the yoghurt and then left to get to work.

And when it's added to the milky mixture inside this incubation tank, it starts

to multiply.

This means that two good bacteria become four; four become eight, and

eight become 16, and so on, until you have lots of good bacteria mixed in

with the milk.

Inside this incubator, he yoghurt has already been mixed, so lets use my

special camera to take a look.

Whoa! It's thick and creamy.

All of that good bacteria has multiplied and multiplied, which has made

everything really thick.

It's turned it into yoghurt.

The yoghurt is cooled down to stop the bacteria multiplying any more.

And it's piped to a smaller tank.

This is plain, natural yoghurt, and it's lovely on its own.

It's great for cooking, you might have even had it on muesli （牛奶什锦早

餐）at home.

But sometimes it's nice to add a bit of flavour.

What flavour do you like?

Do you like peach?

Blackcurrant?

Let's see what flavour this yoghurt's going to be.

This is strawberry puree, and it/s going to turn the plain yoghurt into

strawberry yoghurt.

My favourite.

The mixer turns the yoghurt and fruit puree into a lovely pink colour.

It's now time for the drop test.

And this is where the team check that the yoghurt is the right thickness.

If the yoghurt is thick enough, it's ready to go into pots.

The machine works so quickly. Once dollop （一团）of yoghurt in every

pot.

And look how many pots there are.

This factory could make over a million pots of yoghurt a day.

I love the sound of the lids being glued down onto the pots.

It sounds like a train going over tracks.

CLACKETY-CLACK1CLACKETY-CLACK!

And here we go, a finished pack of yoghurt.

Just like you'd see in the shops, or maybe even in the fridge at home.

What was your favourite part about seeing how yoghurt was made?

Do you remember what part of the cow the milk comes from?

That's right- it's udder.

Did you hear the sound of the lids being pressed onto the pots?

CLACKETY-CLACK1CLACKETY-CLACK!

And did you see how the bacteria thickened the yoghurt?

So, the next time you tuck into a tasty yoghurt, you'll know that it started