쉐도잉 연습: Bare Hand Bottle Busting- Science Investigation - 영상으로 영어 말하기 배우기
레슨 만드는 중...
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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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이 레슨의 어휘와 말하기 포인트
이 B2 수준 말하기 레슨은 영상 “Bare Hand Bottle Busting- Science Investigation”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: bottle, break, vacuum, liquid, bottom. 이 영상에는 섀도잉할 문장 57개와 단어 948개가 있습니다. 말하는 구간의 길이는 5:25입니다. 화자는 분당 약 175단어로, 일상 대화에 가까운 자연스러운 속도로 말합니다. 단어의 85%가 영어에서 가장 많이 쓰이는 3,000단어에 속합니다. 나머지는 연습 전에 미리 확인해 두세요.
이 영상의 핵심 어휘
영상에서 가장 어려운 단어 14개를 발음, 뜻과 함께 정리했습니다.
| 단어 | 발음 | 뜻 |
|---|---|---|
| vacuum 명사 | /ˈvæ.kjuːm/ | 진공 |
| vapor 명사 | /ˈveɪpɚ/ | 증기 |
| bubble 명사 | /ˈbʌbəl/ | 거품 |
| snowball 명사 | /ˈsnoʊbɔl/ | 눈덩이, 눈뭉치 |
| backyard 명사 | /bækˈjɑːd/ | 뒤뜰 |
| rupture 명사 | /ˈɹʌpt͡ʃɚ/ | 터짐 |
| superpower 명사 | 초강대국, 초대국 | |
| cushion 명사 | /ˈkʊʃən/ | 쿠션, 방석 |
| cavity 명사 | /ˈkæv.ɪt.i/ | 강, 공동 |
| believer 명사 | /bɪˈlivɚ/ | 신도, 신자 |
| dense 형용사 | /ˈdɛns/ | 짙다 |
| momentum 명사 | /ˌmə(ʊ)ˈmɛntəm/ | 운동량 |
| flame 명사 | /fleɪm/ | 불꽃, 불길 |
| react 동사 | /ɹiːˈækt/ | 반응하다 |
영상에 나오는 구동사
| 단어 | 뜻 |
|---|---|
| break out 동사 | 탈출하다 |
| come back 동사 | 돌아오다 |
| go back 동사 | 돌아가다 |
이 영상의 문법
화자가 가장 많이 쓰는 문형을 영상 속 실제 표현과 함께 정리했습니다.
| 문형 | 영상 속 표현 |
|---|---|
| 현재완료 have/has + 과거분사 — 과거의 일이 지금도 관련이 있을 때 | I've heard · we've put · we've isolated |
| 수동태 be + 과거분사 — 누가 하는지보다 무슨 일이 일어나는지에 초점 | is filled · is carbonated · is confirmed |
주의할 발음
화자는 we're, don't, gonna 같은 축약형과 약화된 형태를 30번 사용합니다. 들리는 대로 짧게 발음하세요.
- 긴 단어 — 강세 위치에 주의: carbonated /ˈkɑɹ.bəˌneɪ.təd/, momentum /ˌmə(ʊ)ˈmɛntəm/
한국어 화자가 어려워하는 소리:
- /v/ — ㅂ(/b/)과 구별하기: vacuum /ˈvæ.kjuːm/, vapor /ˈveɪpɚ/, cavity /ˈkæv.ɪt.i/, believer /bɪˈlivɚ/, convert /kənˈvɝt/
- /r/과 /l/ 구별하기: sparkling /ˈspɑɹkl̩ɪŋ/, precisely /pɹɪˈsaɪs.li/
이 영상으로 연습하는 방법
- 먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
- 0.75배속으로 한 문장씩 섀도잉을 시작하고, 익숙해지면 보통 속도로 돌아갑니다.
- 자신의 목소리를 녹음해 원본과 비교하고, vacuum, vapor, bubble 같은 단어에 특히 주의합니다.
쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법
쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.