Oobleck and Non-Newtonian Fluids: Crash Course Kids #46.1 - By Crash Course Kids
Transcript
| 00:09 | you know what we haven't talked about in a while | |
| 00:12 | . Things that matter like mass and materials and particles | |
| 00:15 | , I guess what I mean is things that have | |
| 00:17 | to do with matter . We've already talked a lot | |
| 00:20 | about the different states of matter . You know , | |
| 00:22 | some matter comes in the form of a solid , | |
| 00:24 | others in a liquid and still others in a gas | |
| 00:27 | . But are you ready for a question that will | |
| 00:29 | bend your brain a little ? What if there is | |
| 00:31 | matter that fits into more than one of these categories | |
| 00:34 | ? Is there such a thing if there is ? | |
| 00:36 | What's it like ? And can I make some maybe | |
| 00:39 | in my kitchen before I answer any of these questions | |
| 00:46 | ? Let's take a closer look at different states of | |
| 00:48 | matter . You remember what a solid is ? It's | |
| 00:50 | matter that has a definite size and shape like this | |
| 00:53 | desk that I'm sitting at or the clothes that I'm | |
| 00:55 | wearing and well , all of me , I'm a | |
| 00:57 | person with a definite size and shape liquid is matter | |
| 01:00 | . That has a definite size , but no definite | |
| 01:02 | shape . The water in this glass is a liquid | |
| 01:05 | . It has a definite size , but no definite | |
| 01:07 | shape . Like you could say that my desk is | |
| 01:09 | desk shaped , but there's no such thing as water | |
| 01:12 | shaped and the gases matter that has no definite size | |
| 01:15 | or shape the air around me and you is a | |
| 01:18 | gas . It's not shaped like anything in its size | |
| 01:20 | changes depending on how big the container is , that | |
| 01:23 | it's in . Now . All solids , liquids and | |
| 01:25 | gases are materials or objects made of matter and all | |
| 01:29 | materials have properties or traits that help identify them like | |
| 01:32 | their color or shape or size or temperature or wait | |
| 01:36 | and now that you're properly refreshed on the states of | |
| 01:38 | matter , I'm going to cheat and answer our big | |
| 01:40 | question a little early or at least part of it | |
| 01:43 | . Yes . Some materials aren't so easily lumped into | |
| 01:45 | just one state of matter . These unusual materials can | |
| 01:48 | actually act like multiple states of matter . Right ? | |
| 01:51 | I want to be just such a material . Then | |
| 01:53 | let me introduce you to non newtonian fluids . The | |
| 01:57 | non what now ? Non newtonian fluids are substances that | |
| 02:00 | don't behave like we expect them to . These fluids | |
| 02:02 | might look like one thing , but they behave like | |
| 02:05 | another . So what makes a substance ? Non Newtonian | |
| 02:08 | ? Let's find out by making a non newtonian mixture | |
| 02:11 | of our own . Say hello to public , believe | |
| 02:19 | it or not . I didn't make this word up | |
| 02:20 | . It comes from a book written by Dr Seuss | |
| 02:22 | . You know the guy who wrote The Cat in | |
| 02:24 | the Hat ? In another book he wrote called Bartholomew | |
| 02:26 | in the public . There's a king who gets bored | |
| 02:28 | with normal everyday weather . So instead he makes sticky | |
| 02:30 | stuff fall from the sky . That's where public . | |
| 02:33 | The stuff that we're going to play with today gets | |
| 02:35 | its name . But the stuff we're talking about is | |
| 02:38 | real . Our public is a non Newtonian substance with | |
| 02:41 | a pretty simple recipe . No magical kings required . | |
| 02:44 | All you need is about 1.5 cups of corn starch | |
| 02:47 | , about one cup of water . A big bowl | |
| 02:49 | and a spoon pour the corn starch into your bowl | |
| 02:52 | and slowly add some water . Keep stirring until the | |
| 02:54 | mixture feels kind of like honey in the end . | |
| 02:56 | It should look like this . Now grab some of | |
| 02:59 | this goo in your hand . When you squeeze it | |
| 03:00 | , it will form a solid ball in your palm | |
| 03:03 | , but when you unclench your fist and release the | |
| 03:06 | pressure , it'll slide between your fingers like a liquid | |
| 03:09 | . All fluids have a property known as viscosity , | |
| 03:12 | which is basically the rate at which a fluid flows | |
| 03:14 | . And newtonian fluids or normal fluids flow at a | |
| 03:18 | consistent rate . But non newtonian fluids or non normal | |
| 03:21 | fluids flow at a different rate depending on how much | |
| 03:25 | force or pressure is applied to them . So your | |
| 03:27 | public flows at a much slower rate when pressure is | |
| 03:29 | applied to it , acting like a solid , but | |
| 03:32 | when the pressure is removed , it flows faster and | |
| 03:35 | behaves like a liquid . Good for you . Public | |
| 03:37 | being normal is overrated , right ? So if an | |
| 03:44 | object viscosity or flow rate is not constant or changes | |
| 03:48 | depending on the pressure applied to it , it's a | |
| 03:50 | non newtonian fluid , which means yes , some materials | |
| 03:53 | can fit into more than just one state of matter | |
| 03:56 | . These materials are called non newtonian fluids and they | |
| 03:59 | don't play by your regular rules of matter . They'll | |
| 04:02 | be a solid sometimes , and then a liquid at | |
| 04:04 | others . You do you non newtonian fluids . I | |
| 04:07 | like your style |
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