00:06If you've got a question and you don't know where to go, ask Nina for some help, cause she's got
00:11a science show.
00:12She makes sense of her senses while helping all her fans by doing her experiments with potions and with bags.
00:18Touch her tongue, fingers, eyes, ears, nose.
00:24Nina and the neurons find out what you need to know, Nina and the neurons find out what you need
00:29to know.
00:30Look, he helps us with her eyes and Felix with our touch.
00:33Ollie sniffs our smells and sends some bells she hears so much.
00:36But it's Ollie's brother, he helps us with our taste.
00:39Send Nina's little neurons and they're coming to your place.
00:42Touch her tongue, fingers, eyes, ears, nose.
00:48Nina and the neurons find out what you need to know.
00:51Yeah, the neurons find out what you need to know.
00:54Oh, yeah!
00:59Oh, hello. I'm just making a cup of tea in my favourite mug and now all I need to do
01:04is add the milk.
01:06Ah, there we go. Perfect.
01:09Oh, I hear a beep, I see a flash. I wonder what they're going to ask.
01:21Hi, Nina.
01:23Hello there.
01:24I've got a question for you. How does a flask work?
01:28That's a great question. How does a flask work?
01:32A flask is a brilliant invention because it means we can take a hot or a cold drink with us
01:37wherever we go.
01:38Why don't you come down to my workshop and we'll check it out?
01:41See you soon, Nina. Bye.
01:44See you soon.
01:46Well, I'm going to need some help to answer this one and I know just who to ask.
01:50OK, neurons, time to get to work.
02:13OK, today's question is how does a flask work?
02:17Now, which neuron do you think will be most useful in helping us find the answer?
02:20Me! Me! Me! Me! Me!
02:24Will it be Fabulous Felix?
02:26I can help so very much if you need the sense of touch.
02:30Will it be Beautiful Bell?
02:32I send messages to Brain from ear. If there's a sound, I'll help you hear.
02:37Will it be Lovely Look?
02:39For looking and seeing, day or night, I'll help you with your sense of sight.
02:43Will it be Awesome Ollie?
02:45If it's Pony or Wiffy but you can't tell, my messages help your sense of smell.
02:50Or will it be baby bud?
02:52Sour, salty, bitter or sweet? I'm your taste buddy whenever you eat!
03:01It's Felix!
03:03Go Felix! Go Felix! Go Felix! Go Felix! Go Felix! Go Felix! Go Felix!
03:12Marvellous! A little touch can mean so much, Nina!
03:16Today's question is how does a flask work? And because a flask keeps drinks hot or cold,
03:21and we feel how hot or cold something is, Felix will be helping us today.
03:26But stand by, neurons, I may need help from all of you.
03:28Right, I need to get the workshop ready before the inventors arrive.
03:34Sophie and Megan want to find out all about flasks.
03:37Small flasks, tall flasks, keep your drinks hot or cold flasks.
03:41So today, for one day only, Sophie and Megan become the inventors!
03:49Hi guys!
03:51Hi Nina!
03:52Oh, welcome to my workshop! And you come!
03:55Oh, it's lovely to see you both!
03:57So your question was, how does a flask work?
04:00So why do you want to know all about flasks?
04:02Well, when we go camping, we take hot drinks in our flasks like this hot chocolate.
04:08Oh!
04:09And when we go to the beach, we take cold drinks like this juice.
04:13And we want to know how hot things keep hot and cold things cold.
04:19Well, I think the first thing we should do is have a look at your flasks.
04:24So, Megan, you said you put hot chocolate in there this morning.
04:27Well, let's see if it's still hot.
04:29Watch your fingers, Nina.
04:31You can feel the warmth coming right through the cup.
04:35You're right, Felix.
04:36It certainly feels warm.
04:40Mmm!
04:41Oh, and it tastes warm too.
04:43Now, can I try some of your cold drink?
04:45Yes.
04:46Oh, thank you very much.
04:51Ooh, lovely.
04:53Mmm, yummy orange!
04:55Mmm.
04:56Oh, well, that's really cold.
04:58So we know that flasks definitely keep hot things hot and cold things cold.
05:04But how do they do it?
05:05Well, let's get inside and have a closer look.
05:07Now, taking things apart is my job.
05:09It can be dangerous, so don't do this yourself.
05:12That's right.
05:13Nina's been specially trained to do this.
05:15You could get hurt when you take things apart, so it's best to leave it to the experts.
05:20Now, here we have the inside of a flask.
05:24So, as you can see, a flask has a cap, an outer case, and an inner container.
05:31Now, some flasks have a glass or plastic inner container, but this one has a metal one.
05:36Now, this space in between here, that's the most interesting part of a flask.
05:44You see, in between these two sides is nothing at all.
05:49Nothing?
05:50But it's a special sort of nothing.
05:52You see, if you were to look at this glass jar over here, now it looks empty.
05:58But, in fact, there's actually something in it.
06:01Can you guess what it is?
06:02Air.
06:02That's right, air.
06:04So, air is inside most things that look empty, but in between these two sides is nothing at all.
06:11There's not even air.
06:12And we call this a vacuum.
06:14So, why is there a vacuum in a flask?
06:18Well, it's all to do with heat.
06:21Now, here is a cup of tea that I made earlier on.
06:25So, would you like to feel the end of the teaspoon?
06:28It feels warm.
06:29And that's because heat travels along things.
06:32So, if we put a teaspoon in a cup of tea, the heat goes up the teaspoon and you can
06:38feel it at the end.
06:39So, heat travels along anything.
06:41But, in a vacuum, there's nothing at all.
06:45So, it's really difficult for the heat to travel through it.
06:48So, if you have something hot inside a vacuum flask, the heat can't get out.
06:53And if you have something really cold in a vacuum flask, heat can't get in to make it warm.
06:57And I know something else that works like a vacuum flask, only it's much bigger.
07:02Shall we go and see another invention in action?
07:05Whoa!
07:05Let's go!
07:12Oh, goody.
07:13I love this bit.
07:15The big inventions always amaze me.
07:18I wonder where we're going.
07:20It works like a flask, only it's much bigger.
07:23That's what Nina said.
07:25I think we've arrived!
07:28So, here we are, everyone.
07:30We've come to the snow slope.
07:31There's so much snow in here.
07:34How can the snow just melt?
07:36Oh, that's a very good question.
07:37And I think it might have something to do with the walls and the windows.
07:41So, let's go and have a closer look.
07:47They just look like normal windows and walls.
07:51Yeah, they do look just like normal windows and walls, but they're not.
07:56These windows have a vacuum inside them, just like our vacuum flask.
08:00And these walls are specially designed to keep the heat out.
08:04Oh, we're inside a giant flask!
08:08We're like chocolate chip ice cream!
08:11Bud's right.
08:12It is like a giant flask in here.
08:14And that keeps the snow nice and cold.
08:16So, seeing as we're surrounded by so much lovely snow,
08:19shall we go and have some fun?
08:20Yeah!
08:22Let's go!
08:38Oh, that was brilliant fun!
08:40And we know that the snow is lovely and cold and it stays that way because the walls and windows
08:46in here act like a giant flask.
08:48So, I think we should get back to the workshop and get inventing, so let's go!
08:53Well, flasks are a really clever idea.
08:56But who actually invented the flask?
08:59Oh!
08:59Oh!
09:00I know that!
09:02It was actually a scientist called James Dewar.
09:07He loved nothing better than experimenting with cold liquids.
09:12But he had one problem.
09:14The liquids didn't stay cold for very long.
09:17He needed to create something that kept his experiments cold.
09:21So, he invented the first ever flask.
09:30So, your question was, how does a flask work?
09:33And so far we've found out that a flask has an outer case and an inner container.
09:37And the space between those is a vacuum.
09:40And because of the vacuum, the heat can't travel into or out of the flask.
09:44Now, you can't make your own vacuum at home, but if we use things that heat travels through more slowly,
09:50we can make a flask that will keep things warm or cold for much longer than it would in an
09:55ordinary bottle.
09:56So, the first thing we're going to do is grab a piece of tinfoil and we're going to wrap the
10:01tinfoil around the juice bottle.
10:03Okay?
10:13Now, because the tinfoil is shiny, it will help to keep the heat in.
10:17Now, let's just pop it to the side for now and take your small bottle and we're going to cover
10:22it with tinfoil as well.
10:24So, we have another bit here.
10:26And same again.
10:29That's it.
10:38Now, because we don't have a vacuum, we need something that heat travels through a bit more slowly.
10:43And we're going to use some bubble wrap.
10:46So, take this piece of bubble wrap and keep it folded in half like that and fold it again.
10:54And we need it to be small enough so it will fit in the bottom of our big bottle.
11:00So, squash it in.
11:03So, the bubble wrap is going to sit in the bottom.
11:07And the last thing we need to do is to take this piece of bubble wrap, lay it out and
11:12to wrap our small bottle with it.
11:23Excellent!
11:23Now, pop the small bottle inside the big bottle.
11:29And there, you have made your very own flask.
11:33Thanks, Nina!
11:39So, your question was, how does a flask work?
11:43And I think we've answered it.
11:44First of all, when we looked inside a flask, we discovered there's a space between the outer case and the
11:50inner container.
11:51And this space is called a vacuum, which means there's nothing in there, not even air.
11:56And heat needs something to move in and out of, so if there's nothing there, it just can't go anywhere.
12:01So, if you put something hot in a vacuum flask, it stays hot because the heat can't get out.
12:06And if you put something cold in a vacuum flask, it will stay cold because heat can't get in and
12:12warm it up.
12:13But after a long time, the liquid in a vacuum flask will get either hot or cold because heat can
12:18get in or out through the cap.
12:20And that is how a flask works. So, thank you very much for your brilliant question today.
12:26Thanks, Nina! Bye!
12:29Bye!
12:35If you want to make today's invention, just go to the Nina section on the CBeebies website.
12:40That will give you all the instructions you need to make your very own.
12:43Or you may have other ideas of what you want to invent.
12:47Pikes!
12:48Tricks!
12:49Binoculars!
12:50Televisions!
12:51Speakers!
12:52And calls!
12:53We all love inventing.
12:56Whoa!
12:58Go inventing!
12:59We all love inventing.
13:02Why don't you try it too?
13:05Inventions make life easier and help us get things done.
13:10Go inventing!
13:11I always like to take a look at how they work and run.
13:16Go inventing!
13:17We all love inventing.
13:20Whoa!
13:22Go inventing!
13:23We all love inventing.
13:26Why don't you try it too?
13:29It's been a marvellous day.
13:31Feeling hot one minute and cold the next.
13:35Ah, it's been such a great day man.
13:39Seeing inside the flask was fantastic.
13:42We couldn't see the vacuum though, because there's nothing in a vacuum to see.
13:47I've had a fabby day!
13:50Sledging down the snow slope was the best!
13:53Oh, I've had a brilliant day.
13:55I really liked it when everyone made their own flasks.
13:58All those crinkling and sticking sounds.
14:00Our day's been bursting with inventions.
14:03I hope you've enjoyed it.
14:04See you again soon.
14:05Bye!
14:06Bye!
14:11Go inventing!
14:12Bye-bye!
14:13Bye!
14:14Bye!
14:14Bye!
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