0:00:05 > 0:00:08# If you've got a question And you don't know where to go
0:00:08 > 0:00:11# Ask Nina for some help Cos she's got a science show
0:00:11 > 0:00:15# She makes sense of her senses While helping all her fans
0:00:15 > 0:00:17# By doing her experiments With potions and with bangs
0:00:17 > 0:00:19- # Touch your tongue - Tongue!
0:00:19 > 0:00:20- # Fingers - Fingers!
0:00:20 > 0:00:23- # Eyes.- Eyes! - Ears.- Ears!- Nose.- Nose!
0:00:23 > 0:00:26# Nina and the Neurons Find out what you need to know
0:00:26 > 0:00:29# Nina and the Neurons Find out what you need to know
0:00:29 > 0:00:32# Luke, he helps us with our eyes And Felix with our touch
0:00:32 > 0:00:35# Ollie sniffs out smells And Belle, she hears so much
0:00:35 > 0:00:38# Bud is Ollie's brother He helps us with our taste
0:00:38 > 0:00:41# They're Nina's little neurons And they're coming to your place!
0:00:41 > 0:00:43- # Touch your tongue - Tongue!
0:00:43 > 0:00:44- # Fingers - Fingers!
0:00:44 > 0:00:48- # Eyes.- Eyes! - Ears.- Ears!- Nose.- Nose!
0:00:48 > 0:00:50# Nina and the Neurons Find out what you need to know
0:00:50 > 0:00:53# Nina and the Neurons Find out what you need to know
0:00:53 > 0:00:55# Oh yeah! #
0:00:57 > 0:00:58Oh, hello.
0:00:58 > 0:01:02I'm experimenting with sparkling water.
0:01:03 > 0:01:05Now watch this.
0:01:09 > 0:01:13The raisins are dancing with the bubbles!
0:01:13 > 0:01:15- BEEPING - I hear a beep, I see a flash.
0:01:15 > 0:01:18I wonder what they're going to ask.
0:01:21 > 0:01:23ALL: Hi, Nina.
0:01:23 > 0:01:25Hi, guys.
0:01:25 > 0:01:30- We've got a question for you.- Why does the lid on the soup pan rattle?
0:01:30 > 0:01:34That's a great question. Why does the lid on a soup pan rattle?
0:01:34 > 0:01:38I've noticed that, too. I wonder what causes it.
0:01:38 > 0:01:42Why don't you all come to my lab and we'll do some experiments.
0:01:42 > 0:01:47- ALL: See you soon, Nina! Bye! - Bye!
0:01:47 > 0:01:52I'll need help to answer this and I know just who to ask.
0:01:52 > 0:01:55OK, Neurons, time to get to work.
0:02:11 > 0:02:13ALL: Neurons at the ready, Nina.
0:02:13 > 0:02:17OK. Today's question is, why does the lid on a soup pan rattle?
0:02:17 > 0:02:21Which Neuron will be most useful to help find the answer?
0:02:21 > 0:02:24ALL: Me! Me! Me! Oh, me!
0:02:24 > 0:02:27Will it be fabulous Felix?
0:02:27 > 0:02:31I can help so very much if you need the sense of touch.
0:02:31 > 0:02:32will it be beautiful Belle?
0:02:32 > 0:02:37I send messages to brain from ear. If there's a sound, I'll help you hear.
0:02:37 > 0:02:39Will it be lovely Luke?
0:02:39 > 0:02:41For looking and seeing, day or night,
0:02:41 > 0:02:44I'll help you with your sense of sight.
0:02:44 > 0:02:46Will it be awesome Ollie?
0:02:46 > 0:02:49If it's pongy or whiffy but you can't tell,
0:02:49 > 0:02:53- my messages help your sense of smell. - Or will it be baby Bud?
0:02:53 > 0:02:57Sour, salty, bitter or sweet, I'm your taste buddy whenever you eat!
0:03:01 > 0:03:03It's Belle!
0:03:03 > 0:03:06NEURONS: Go, Belle! Go, Belle! Go, Belle!
0:03:06 > 0:03:11Go, Belle! Go, Belle! Go, Belle! Go, Belle!
0:03:11 > 0:03:14Brilliant. I'm all ears, Nina.
0:03:14 > 0:03:18Today's question is, why does the lid on a soup pan rattle?
0:03:18 > 0:03:21To listen to the rattle, we use our hearing,
0:03:21 > 0:03:24so Belle will be helping me. But stand by, Neurons.
0:03:24 > 0:03:27I may need help from all of you.
0:03:27 > 0:03:31I'd better heat some soup up before the Experimentors arrive.
0:03:33 > 0:03:34Jake likes sports,
0:03:34 > 0:03:36Poppy loves horse riding
0:03:36 > 0:03:37and Josh loves cars
0:03:37 > 0:03:41but they all want to find out about rattling pans.
0:03:41 > 0:03:46So, for one day only, Jake, Poppy and Josh become the Experimentors!
0:03:48 > 0:03:54- ALL: Hi, Nina. - Welcome to my lab. Come in.
0:03:54 > 0:03:56It's lovely to see you all.
0:03:56 > 0:04:00You asked, why does the lid on a soup pan rattle?
0:04:00 > 0:04:01But why do you want to know?
0:04:01 > 0:04:05My mum cooks soup at home. The lid really rattles.
0:04:05 > 0:04:08But we want to know why.
0:04:08 > 0:04:12My pan lid rattles, too, when I make soup,
0:04:12 > 0:04:16which you can probably hear. I think we need to investigate.
0:04:16 > 0:04:19For our first experiment, we'll use our senses.
0:04:19 > 0:04:24ALL: Whoop-whoo! A senses experiment! We're ready, Nina.
0:04:24 > 0:04:26For safety, you're standing well back
0:04:26 > 0:04:32- because this soup is very hot. - Hot things can be very dangerous.
0:04:32 > 0:04:35Let's listen carefully.
0:04:35 > 0:04:38- What can you hear?- It's rattling.
0:04:38 > 0:04:44It's that noise, Nina. It's quite tinny. T-t-t-t-t-t.
0:04:44 > 0:04:46Hm. Now what can you see?
0:04:46 > 0:04:49The lid seems to be shaking.
0:04:49 > 0:04:51It's moving up and down.
0:04:51 > 0:04:55Yes, the lid's moving up and down a tiny bit.
0:04:55 > 0:04:58I want to look inside, but it's very hot,
0:04:58 > 0:05:00so I'll put on my heatproof gloves.
0:05:03 > 0:05:04Whoo.
0:05:04 > 0:05:08And this here is my NinaCam.
0:05:08 > 0:05:11If I hold it over the top of the soup,
0:05:11 > 0:05:17- you can see what's happening inside. - Soup. Mmm. That smells delicious.
0:05:17 > 0:05:22- So what can you see and hear now? - EXPERIMENTORS: Bubbles.
0:05:22 > 0:05:23Yeah.
0:05:23 > 0:05:25What a brilliant noise!
0:05:25 > 0:05:28That's right. The bubbles are quite noisy.
0:05:28 > 0:05:30Let me just turn this off...
0:05:32 > 0:05:33OK.
0:05:33 > 0:05:36What can you see now?
0:05:36 > 0:05:38The bubbles are gone.
0:05:38 > 0:05:42That's right. The soup isn't bubbling any more.
0:05:42 > 0:05:44And...what about the pan lid?
0:05:44 > 0:05:47It's stopped going up and down.
0:05:47 > 0:05:51Right. We could hear the lid rattling, see the soup bubbling
0:05:51 > 0:05:54When I switched the Bunsen burner off,
0:05:54 > 0:05:58the bubbling and rattling stopped. That's interesting.
0:05:58 > 0:06:00Time for another experiment.
0:06:02 > 0:06:07My NinaCam showed us lots of bubbles popping on the surface of the soup.
0:06:07 > 0:06:11This experiment will show us what makes the soup bubble.
0:06:11 > 0:06:14I'm wearing my heatproof gloves
0:06:14 > 0:06:18because we're using the Bunsen burner to heat up this water.
0:06:18 > 0:06:20Soup has lots of water in it,
0:06:20 > 0:06:23along with yummy foods and flavours.
0:06:23 > 0:06:26So let's see what happens when water heats up.
0:06:26 > 0:06:30Water doesn't smell lovely, like soup.
0:06:30 > 0:06:33What can you see in the water?
0:06:33 > 0:06:35- Bubbles!- Bubbles!
0:06:35 > 0:06:38Yeah. So where are they moving to?
0:06:38 > 0:06:40The bubbles are moving up.
0:06:40 > 0:06:45Yes. The bubbles started at the bottom and moved up to the top.
0:06:45 > 0:06:47So when we heat water enough,
0:06:47 > 0:06:51like water in our soup, some of it turns into a gas.
0:06:51 > 0:06:55Most gases are invisible, like the air around us
0:06:55 > 0:07:00but in liquid, the gas makes bubbles that we can see
0:07:00 > 0:07:04which rise to the surface and pop, releasing the gas.
0:07:04 > 0:07:08I think we need to find out more. To do that, we need to visit
0:07:08 > 0:07:11a very special castle. Hoo-hoo!
0:07:17 > 0:07:20Hm. Where do you think we're going today?
0:07:20 > 0:07:25Nina said it's somewhere with a special castle.
0:07:25 > 0:07:30A castle! I wonder if it will have a king and queen in it!
0:07:30 > 0:07:32Or maybe a beautiful princess!
0:07:32 > 0:07:35Ooh, I think we're here.
0:07:35 > 0:07:36Oh, look!
0:07:41 > 0:07:46Hm. That's odd. The special castle is supposed to be around here
0:07:46 > 0:07:49but I can't see it. Can you?
0:07:49 > 0:07:51ALL: No, Nina.
0:07:51 > 0:07:54Ooh, I wonder what this is over here.
0:07:54 > 0:07:56Ahh, that's interesting.
0:07:56 > 0:07:58Inflatable rubber rings.
0:07:58 > 0:08:01Let's see what happens if we blow them up.
0:08:06 > 0:08:10Ooh, Nina's rubber ring feels firmer already.
0:08:10 > 0:08:15Oh, hoo-hoo! So what's happening to the rubber rings?
0:08:15 > 0:08:17They're getting bigger, Nina.
0:08:17 > 0:08:22Yes, they're getting bigger because we're blowing air into them.
0:08:22 > 0:08:23Air is a gas
0:08:23 > 0:08:25and when you push it into a space,
0:08:25 > 0:08:29it spreads out and fills up as much of the space as it can.
0:08:29 > 0:08:30- MOTOR HUMS - Oh.
0:08:30 > 0:08:35What's that noise? It's getting louder and louder.
0:08:35 > 0:08:38Fantastic! I thought we were in the right place!
0:08:38 > 0:08:41This is a very special bouncy castle.
0:08:41 > 0:08:45It's going to show us what happens if a gas gets trapped.
0:08:45 > 0:08:49Fantastic! I'm going to bounce and bounce, and bounce!
0:08:49 > 0:08:53Boing! Boing! Boing! Boing! Boing!
0:08:53 > 0:08:58- What can you see happening? - It's rising up and getting bigger.
0:08:58 > 0:09:03That's right and it's getting bigger because air is being pumped into it.
0:09:03 > 0:09:05Remember, gases like to spread out
0:09:05 > 0:09:08and take up as much space as possible.
0:09:08 > 0:09:12Since the air is trapped, it'll keep spreading out
0:09:12 > 0:09:14until it can't any more.
0:09:14 > 0:09:17Then the castle is ready for bouncing on!
0:09:17 > 0:09:18THEY ALL CHEER
0:09:36 > 0:09:38Whoo!
0:09:38 > 0:09:41- Oh, that was great fun, wasn't it? - ALL: Yeah!
0:09:41 > 0:09:45It's time to go back to the lab for one final experiment!
0:09:45 > 0:09:46When I get my breath back!
0:09:49 > 0:09:52Your question was, why does the lid on a soup pan rattle?
0:09:52 > 0:09:56So far we've discovered that when a pan lid rattles,
0:09:56 > 0:09:58it moves up and down a tiny bit.
0:09:58 > 0:10:02and we also know that when we heat water or soup,
0:10:02 > 0:10:06we make bubbles of gas that rise to the surface and pop.
0:10:06 > 0:10:10Our final experiment will show us what happens when gas get trapped
0:10:10 > 0:10:14in our pan under the lid. Let's get experimenting!
0:10:14 > 0:10:17ALL: Yeah!
0:10:17 > 0:10:21OK, so you have your balloon pumps. Grab a hold of them.
0:10:21 > 0:10:24Now we're going to pump up these balloons.
0:10:24 > 0:10:28Three, two, one, go!
0:10:41 > 0:10:46Those balloons are filling the box. There's hardly any room left.
0:10:48 > 0:10:50Keep going.
0:10:53 > 0:10:56And...stop pumping!
0:10:56 > 0:10:58- Yes!- Put your balloon pumps down.
0:10:58 > 0:10:59Wow.
0:10:59 > 0:11:01So what happened?
0:11:01 > 0:11:03The lid came up.
0:11:03 > 0:11:08Yes, the gas that we pumped into the balloons made them get bigger.
0:11:08 > 0:11:13The balloons are taking up so much space, the lid has been pushed up.
0:11:13 > 0:11:16It's just like what happens in a pot of soup.
0:11:16 > 0:11:20The gassy bubbles on the surface of the soup pop,
0:11:20 > 0:11:24releasing gas into the space between the soup and the lid.
0:11:24 > 0:11:25And the gas builds up
0:11:25 > 0:11:27and spreads out in the pot
0:11:27 > 0:11:32and, eventually, there's so much gas that it pushes the lid up.
0:11:32 > 0:11:33Now watch this.
0:11:34 > 0:11:35POP
0:11:35 > 0:11:36NINA LAUGHS
0:11:36 > 0:11:40Now what happened when I burst the balloon?
0:11:40 > 0:11:47- It's going down.- Yeah, what's going down?- The lid!- That's right.
0:11:47 > 0:11:53When I burst the balloon, a bit of gas escaped so the lid went down.
0:11:57 > 0:12:01Your question was, why does the lid on a soup pan rattle?
0:12:01 > 0:12:05I think we've answered it. We found that when you heat soup,
0:12:05 > 0:12:08some of the water in it turns into gassy bubbles
0:12:08 > 0:12:11which pop, releasing gas into the pan.
0:12:11 > 0:12:16The gas builds up under the lid and pushes it up a bit.
0:12:16 > 0:12:20And some of the gas escapes, and the lid falls back down,
0:12:20 > 0:12:25making the rattling noise. I hope that's answered your question.
0:12:25 > 0:12:29It's important to stay away from hot pans and cookers. They can hurt you.
0:12:29 > 0:12:32ALL: Thanks, Nina. Bye!
0:12:32 > 0:12:34Bye! Hee-hee.
0:12:38 > 0:12:42If you want to know more about the science that's all around us,
0:12:42 > 0:12:47go to the Nina section on the CBeebies website. Have fun!
0:12:50 > 0:12:51Lab coat on, Nina.
0:12:51 > 0:12:53Lab coat on, Ollie.
0:12:53 > 0:12:54Safety gloves on, Nina?
0:12:54 > 0:12:56Safety gloves on, Felix.
0:12:56 > 0:12:59Don't forget your goggles, Nina.
0:12:59 > 0:13:02Goggles are on, Luke. I think we're ready!
0:13:04 > 0:13:06# We do experiments in the lab
0:13:06 > 0:13:10# Shooby-dooby, in the lab
0:13:10 > 0:13:12# Bubbling experiments in the lab
0:13:12 > 0:13:13# In the lab!
0:13:13 > 0:13:15# Go, Nina, in the lab
0:13:15 > 0:13:19# Fizzing and popping Steam and smoke
0:13:19 > 0:13:21# We need protection Don't we, folks?
0:13:21 > 0:13:26# We always put our safety first
0:13:26 > 0:13:28# Shooby-dooby, dooby-dooby
0:13:28 > 0:13:30# We do experiments in the lab
0:13:30 > 0:13:31# In the lab!
0:13:31 > 0:13:32# Go, Nina! #
0:13:32 > 0:13:35Oh, I've had a brilliant day.
0:13:35 > 0:13:39Listening to the t-t-t-t of the soup pan lid rattling.
0:13:39 > 0:13:41It's been a marvellous day.
0:13:41 > 0:13:44Heating water made lots of bubbles.
0:13:44 > 0:13:47I've had a fabby day!
0:13:47 > 0:13:53The bouncy castle went boing! Boing! Boing! Brilliant!
0:13:53 > 0:13:56Ahh, it's been such a great day, man!
0:13:56 > 0:13:59Watching them all pumping up the balloons.
0:13:59 > 0:14:02Our day's been bursting with experiments.
0:14:02 > 0:14:05I hope you've enjoyed it. See you soon!
0:14:05 > 0:14:07ALL: Bye!
0:14:07 > 0:14:09E-mail subtitling@bbc.co.uk