Pratique du Shadowing: Bare Hand Bottle Busting- Science Investigation - Apprendre l'anglais à l'oral avec la vidéo
Création de la leçon...
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- Today I am here with Kevin, more commonly known as the Backyard Scientist.
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And as fate would have it, we are actually in- - The backyard.
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- So I recently made a video where I converted a leaf blower into a snowball machine gun and the first thing he said was- - You should set those on fire.
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- So as soon as I got here today, we- But flaming snowballs aren't actually why I'm here today.
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Show 'em why I'm here today, Kevin.
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So I actually don't drink, but I've heard of people doing this with beer bottles.
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So either Kevin has some superpowers, or there's some crazy physics going on there that we're gonna try and figure out today.
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- So neither of us really knows what causes these bottles to break and there's a lot of conflicting evidence out there but we have some of our own ideas.
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- So as firm believers in the scientific method, we are going to science our way to the right answer through a bunch of experiments.
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- I'll drink to that.
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- Not yet you won't, Kevin. - I've heard that one of the reasons people think it's breaking is because when they slam their hand down on it, they're forcing a bunch of air in the bottle and that causes the bottom to shoot out.
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- So in this experiment, we're testing the pressure wave theory, where when a person hits it with their hand, they force a bunch of air in that then creates a pressure wave that pushes out the bottom of the bottle.
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So we've put a cap on the top, so there's no way to force air in.
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We're using a rubber mallet just to be more consistent for all of the hits.
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One. The bottle broke, even though the cap was on, and there was no way to force air in, so we are rejecting this theory.
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- We think carbonation might have something to do with it.
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- Okay so to isolate that, we have one beer that's carbonated, one with water, and then we filled this one with sparkling water.
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So if these two don't break and this one breaks, I think we've isolated that it works better without carbonation.
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- Yes. - So this bottle is filled with sparkling water, so the theory is that it shouldn't break.
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And now for the beer, the bottle didn't break, but that was interesting how much it fizzed up.
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So as it turns out, here's why that happens.
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When you hit the bottle, it moves down really fast, but the liquid hasn't started moving yet.
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That creates an empty gap down here, that's basically a vacuum or really low pressure.
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And if the drink is carbonated, the CO2 from the liquid gets sucked into that vacuum and fills it with CO2 gas bubbles.
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And since these bubbles are less dense than the drink, they rise up through the liquid and create a chain reaction of more bubbles as they go.
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Now finally, we test the water, and just like with the carbonated liquids, you see this vacuum form on the bottom.
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Except this time the bottle breaks.
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So theory number two is confirmed, non-carbonated liquids work better.
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But now we just have to figure out why.
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What are they doing differently to make the bottle actually break?
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- So what I think is breaking the bottle is the momentum of the water going back and filling the vacuum is causing the bottom to break out.
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- And I think the break is happening a little bit earlier.
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When the vacuum is formed like the air outside is at 14 PSI and so it's pushing in on the vacuum.
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So it's before the water rebounds, it's actually cracking because the difference in pressure.
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- Well we'll find out.
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- Round three. Fight!
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- So we're gonna add some red dye and then we're gonna slow the camera down to like 7,000 frames per second to see precisely the moment when it happens.
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One. So if I'm right, okay, bottle, it should break right there.
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- No. - Yes! - You punk.
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Yeah so you're definitely right.
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- Yeah. - It ruptured when the water is coming back right?
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- Cracks right after it hits the bottom.
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- So Kevin was right. In fact, it turns out that water cavity collapses 10 times faster than it formed, which creates a force higher than the initial hit on the bottle, which is why it doesn't break right away.
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So now that you know the science, if you want to impress your friends with this trick, here are a couple important tips.
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Number one, hit the bottle and not your hand.
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You want to make as much energy from your strike go into moving the bottle and not just being reacted by your hand.
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You can even get the neck of the bottle a little wet and then let it slip a bit when you hit it, just to make sure it's moving.
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Number two, like we discovered, use water or something non-carbonated.
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Otherwise, the carbonation just fills in that vacuum and cushions the rebound force.
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Number three, a liquid with a high vapor pressure is good.
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If you use a liquid with a high vapor pressure that means the vacuum you need at the bottom of the bottle will form much easier, so hot water is a lot better than cold water because the vapor pressure's higher.
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Nail polish remover also works well for the same reason.
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Number four, be safe, this is glass, and glass can cut you if you're not careful where it lands.
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Number five, don't chicken out.
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It hurts way more if you don't follow through.
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Plus you look like this.
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- Oh, I heard it. Did it hurt?
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale de niveau B2 s’appuie sur la vidéo « Bare Hand Bottle Busting- Science Investigation ». Les mots qui reviennent le plus souvent : bottle, break, vacuum, liquid, bottom. Cette vidéo contient 57 phrases et 948 mots à répéter en shadowing. La partie parlée dure 5:25. Le locuteur parle à un rythme naturel d’environ 175 mots par minute, proche d’une conversation courante. 85 % des mots font partie des 3 000 mots les plus courants en anglais ; le reste mérite d’être vu avant de commencer.
Vocabulaire clé de cette vidéo
Les 15 mots les plus avancés de la vidéo, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| vacuum nom | /ˈvæ.kjuːm/ | vide, vacuum |
| carbonated adjectif | /ˈkɑɹ.bəˌneɪ.təd/ | gazeux, gazéifié |
| vapor nom | /ˈveɪpɚ/ | vapeur |
| bubble nom | /ˈbʌbəl/ | bulle |
| snowball nom | /ˈsnoʊbɔl/ | boule de neige, balle de neige |
| rebound nom | /ˈɹi.baʊnd/ | rebond |
| sparkling adjectif | /ˈspɑɹkl̩ɪŋ/ | pétillant, effervescent |
| isolate verbe | /ˈaɪ.sə.leɪt/ | isoler, esseuler |
| backyard nom | /bækˈjɑːd/ | arrière-cour |
| blower nom | /ˈbloʊ.ɚ/ | ventilateur |
| mallet nom | /ˈmælɪt/ | mailloche |
| rupture nom | /ˈɹʌpt͡ʃɚ/ | rupture |
| superpower nom | superpuissance | |
| cushion nom | /ˈkʊʃən/ | coussin |
| cavity nom | /ˈkæv.ɪt.i/ | carie |
Les verbes à particule que vous entendrez
| Mot | Sens |
|---|---|
| figure out verbe | cerner |
| turn out verbe | se finir, se terminer |
| break out verbe | s'échapper, s’évader |
| come back verbe | revenir |
| find out verbe | découvrir, savoir |
| go back verbe | rentrer, retourner |
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Present perfect have/has + participe passé — une action passée qui compte encore maintenant | I've heard · we've put · we've isolated |
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | is filled · is carbonated · is confirmed |
Prononciation à surveiller
Le locuteur utilise 30 contractions et formes réduites, comme we're, don't, gonna. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Mots longs — placez bien l’accent: carbonated /ˈkɑɹ.bəˌneɪ.təd/, momentum /ˌmə(ʊ)ˈmɛntəm/
Les sons difficiles pour les francophones :
- /r/ anglais — langue recourbée, sans frotter la gorge: carbonated /ˈkɑɹ.bəˌneɪ.təd/, rebound /ˈɹi.baʊnd/, sparkling /ˈspɑɹkl̩ɪŋ/, rupture /ˈɹʌpt͡ʃɚ/, impress /ɪmˈpɹɛs/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Commencez à la vitesse 0,75×, répétez phrase par phrase, puis revenez à la vitesse normale quand cela devient facile.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme vacuum, carbonated, vapor.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.