Prática de Shadowing: Bare Hand Bottle Busting- Science Investigation - Aprenda a falar inglês com vídeo
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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?
📺 Mesmo canal
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Vocabulário e dicas de fala para esta lição
Esta aula de conversação de nível B2 usa o vídeo “Bare Hand Bottle Busting- Science Investigation”. As palavras que mais se repetem: bottle, break, vacuum, liquid, bottom. Este vídeo tem 57 frases e 948 palavras para praticar shadowing. A fala dura 5:25. O falante fala em ritmo natural, cerca de 175 palavras por minuto, próximo de uma conversa do dia a dia. 85% das palavras estão entre as 3.000 mais comuns do inglês; vale a pena estudar o restante antes de começar.
Vocabulário principal deste vídeo
As 15 palavras mais avançadas do vídeo, com pronúncia e significado:
| Palavra | Pronúncia | Significado |
|---|---|---|
| vacuum substantivo | /ˈvæ.kjuːm/ | vácuo |
| carbonated adjetivo | /ˈkɑɹ.bəˌneɪ.təd/ | gaseificado |
| vapor substantivo | /ˈveɪpɚ/ | vapor |
| bubble substantivo | /ˈbʌbəl/ | bolha, borbulha |
| snowball substantivo | /ˈsnoʊbɔl/ | bola de neve |
| rebound substantivo | /ˈɹi.baʊnd/ | rebote, rebatida |
| sparkling adjetivo | /ˈspɑɹkl̩ɪŋ/ | cintilante |
| isolate verbo | /ˈaɪ.sə.leɪt/ | isolar |
| backyard substantivo | /bækˈjɑːd/ | quintal |
| blower substantivo | /ˈbloʊ.ɚ/ | assoprador, soprador |
| mallet substantivo | /ˈmælɪt/ | malho |
| rupture substantivo | /ˈɹʌpt͡ʃɚ/ | rotura, ruptura |
| superpower substantivo | superpotência | |
| cushion substantivo | /ˈkʊʃən/ | almofada, coxim |
| cavity substantivo | /ˈkæv.ɪt.i/ | cavidade |
Phrasal verbs que você vai ouvir
| Palavra | Significado |
|---|---|
| figure out verbo | descobrir, deduzir |
| turn out verbo | terminar |
| come back verbo | voltar |
| find out verbo | descobrir |
| go back verbo | voltar |
Gramática neste vídeo
As estruturas que o falante mais usa, com as palavras exatas do vídeo:
| Estrutura | No vídeo |
|---|---|
| Present perfect have/has + particípio passado — uma ação passada que ainda importa agora | I've heard · we've put · we've isolated |
| Voz passiva be + particípio passado — o foco está no que acontece, não em quem faz | is filled · is carbonated · is confirmed |
Pronúncia para ficar de olho
O falante usa 30 contrações e formas reduzidas, como we're, don't, gonna. Diga-as na forma curta, do jeito que você ouve.
- Palavras longas — acerte a sílaba tônica: carbonated /ˈkɑɹ.bəˌneɪ.təd/, momentum /ˌmə(ʊ)ˈmɛntəm/
Sons difíceis para falantes de português:
- Consoante final — sem acrescentar um “i” depois: carbonated /ˈkɑɹ.bəˌneɪ.təd/, rebound /ˈɹi.baʊnd/, isolate /ˈaɪ.sə.leɪt/, backyard /bækˈjɑːd/, mallet /ˈmælɪt/
- /l/ final — a língua toca o céu da boca, não vira “u”: bubble /ˈbʌbəl/, snowball /ˈsnoʊbɔl/
- s + consoante no início — sem um “i” antes: snowball /ˈsnoʊbɔl/, sparkling /ˈspɑɹkl̩ɪŋ/, slam /ˈslæm/
Como praticar com este vídeo
- Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
- Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
- Grave a sua voz e compare com o original, prestando atenção a palavras como vacuum, carbonated, vapor.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.