Shadowing Practice: Bare Hand Bottle Busting- Science Investigation - Learn English Speaking with Video
Creando lección...
1
- Today I am here with Kevin, more commonly known as the Backyard Scientist.
2
And as fate would have it, we are actually in- - The backyard.
3
- 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.
4
- So as soon as I got here today, we- But flaming snowballs aren't actually why I'm here today.
5
Show 'em why I'm here today, Kevin.
6
So I actually don't drink, but I've heard of people doing this with beer bottles.
7
So either Kevin has some superpowers, or there's some crazy physics going on there that we're gonna try and figure out today.
8
- 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.
9
- So as firm believers in the scientific method, we are going to science our way to the right answer through a bunch of experiments.
10
- I'll drink to that.
11
- 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.
12
- 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.
13
So we've put a cap on the top, so there's no way to force air in.
14
We're using a rubber mallet just to be more consistent for all of the hits.
15
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.
16
- We think carbonation might have something to do with it.
17
- Okay so to isolate that, we have one beer that's carbonated, one with water, and then we filled this one with sparkling water.
18
So if these two don't break and this one breaks, I think we've isolated that it works better without carbonation.
19
- Yes. - So this bottle is filled with sparkling water, so the theory is that it shouldn't break.
20
And now for the beer, the bottle didn't break, but that was interesting how much it fizzed up.
21
So as it turns out, here's why that happens.
22
When you hit the bottle, it moves down really fast, but the liquid hasn't started moving yet.
23
That creates an empty gap down here, that's basically a vacuum or really low pressure.
24
And if the drink is carbonated, the CO2 from the liquid gets sucked into that vacuum and fills it with CO2 gas bubbles.
25
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.
26
Now finally, we test the water, and just like with the carbonated liquids, you see this vacuum form on the bottom.
27
Except this time the bottle breaks.
28
So theory number two is confirmed, non-carbonated liquids work better.
29
But now we just have to figure out why.
30
What are they doing differently to make the bottle actually break?
31
- 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.
32
- And I think the break is happening a little bit earlier.
33
When the vacuum is formed like the air outside is at 14 PSI and so it's pushing in on the vacuum.
34
So it's before the water rebounds, it's actually cracking because the difference in pressure.
35
- Well we'll find out.
36
- Round three. Fight!
37
- 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.
38
One. So if I'm right, okay, bottle, it should break right there.
39
- No. - Yes! - You punk.
40
Yeah so you're definitely right.
41
- Yeah. - It ruptured when the water is coming back right?
42
- Cracks right after it hits the bottom.
43
- 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.
44
So now that you know the science, if you want to impress your friends with this trick, here are a couple important tips.
45
Number one, hit the bottle and not your hand.
46
You want to make as much energy from your strike go into moving the bottle and not just being reacted by your hand.
47
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.
48
Number two, like we discovered, use water or something non-carbonated.
49
Otherwise, the carbonation just fills in that vacuum and cushions the rebound force.
50
Number three, a liquid with a high vapor pressure is good.
51
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.
52
Nail polish remover also works well for the same reason.
53
Number four, be safe, this is glass, and glass can cut you if you're not careful where it lands.
54
Number five, don't chicken out.
55
It hurts way more if you don't follow through.
56
Plus you look like this.
57
- Oh, I heard it. Did it hurt?
📺 Mismo canal
B21
How to Escape Alcatraz With Basic Engineering
Daily ConversationUniversity StudentsWorking Adults
B22
I Outsmarted Pro Car Thieves
American AccentBusiness EnglishUniversity StudentsWorking Adults
B211
3 Levels of Car Theft
American AccentDaily ConversationUniversity StudentsWorking Adults
B24
1st place Egg Drop project ideas- using SCIENCE
American AccentDaily ConversationHigh School StudentsUniversity Students
B16
I Discovered a Lost Plane
American AccentUniversity Students
B23
I Engineered The Perfect First Date
American AccentTeensDaily ConversationHigh School Students
B29
Drinking Nasty Swamp Water (to save the world)
American AccentDaily ConversationUniversity StudentsWorking Adults
B24
How to Survive a Grenade Blast
American AccentIELTS PrepTOEFL PrepUniversity Students
B121
Unbreakable Ice Cream Safe
American AccentDaily ConversationUniversity StudentsWorking Adults
B13
Skin a Watermelon Party Trick
American AccentTeensDaily Conversation
B21
This Ball is Impossible to Hit
American AccentBusiness EnglishDaily ConversationHigh School Students
B221
How To Keep a Skyscraper From Falling Over
American AccentIELTS PrepTOEFL PrepUniversity Students
C16
My Puzzle Robot is 200x Faster Than a Human
American AccentBusiness EnglishUniversity StudentsWorking Adults
B210
Can You Safely Drink Your Own Pee?
American AccentBusiness EnglishUniversity StudentsWorking Adults
B26
Backyard Squirrel Maze 2.0- The Walnut Heist
American AccentDaily ConversationUniversity StudentsWorking Adults
B22
Last Cheater Standing Wins $10,000!
American AccentBusiness EnglishUniversity StudentsWorking Adults
B27
Engineers vs Junkyard RC Car Death Match
American AccentTeensDaily ConversationHigh School Students
B21
Automatic Bullseye, MOVING Dartboard
American AccentBusiness EnglishUniversity StudentsWorking Adults
B210
I Gave the MIT Commencement Speech
American AccentBusiness EnglishDaily ConversationUniversity Students
B211
Testing The World's Smartest Crow
American AccentDaily ConversationUniversity StudentsWorking Adults
✨ Recomendar Video
B23
73 oraciones
Box of Goodies | The Big Bang Theory
American AccentDaily ConversationUniversity StudentsWorking Adults
B21
77 oraciones
Science hacks for crispy snacks
Daily ConversationUniversity StudentsWorking Adults
B11
303 oraciones
Craziest Official Brand Collabs
American AccentBusiness EnglishDaily ConversationUniversity Students
B21
98 oraciones
how to make Coca Cola
Business EnglishDaily ConversationUniversity Students
B21
281 oraciones
I Tried Turning a Tree into Soda
Daily ConversationUniversity StudentsWorking Adults
B2242 oraciones
Stop drying your hair wrong: the science
Business EnglishDaily ConversationUniversity Students
B21
297 oraciones
This Will Change How You Store Coffee
Business EnglishDaily ConversationUniversity Students
B26
310 oraciones
Why Scientists Are Warning Us About Everyday Plastics | 60 Minutes Australia
Daily ConversationUniversity StudentsWorking Adults
B21
349 oraciones
THE DISCLAIMER: Let It Breathe
Business EnglishDaily ConversationUniversity Students
B23
268 oraciones
The Shoe That Broke Running
American AccentBusiness EnglishDaily ConversationUniversity Students
Vocabulario y notas de pronunciación para esta lección
Esta lección de conversación de nivel B2 se basa en el vídeo “Bare Hand Bottle Busting- Science Investigation”. Las palabras que más se repiten: bottle, break, vacuum, liquid, bottom. Este vídeo tiene 57 frases y 948 palabras para practicar shadowing. La parte hablada dura 5:25. El hablante habla a un ritmo natural de unas 175 palabras por minuto, cercano a una conversación cotidiana. El 85 % de las palabras está entre las 3.000 más comunes del inglés; conviene repasar el resto antes de empezar.
Vocabulario clave de este vídeo
Las 15 palabras más avanzadas del vídeo, con su pronunciación y significado:
| Palabra | Pronunciación | Significado |
|---|---|---|
| vacuum sustantivo | /ˈvæ.kjuːm/ | vacuo |
| carbonated adjetivo | /ˈkɑɹ.bəˌneɪ.təd/ | carbonatado, gaseoso |
| vapor sustantivo | /ˈveɪpɚ/ | vapor |
| bubble sustantivo | /ˈbʌbəl/ | burbuja, pompa |
| snowball sustantivo | /ˈsnoʊbɔl/ | bola de nieve, bola nival |
| rebound sustantivo | /ˈɹi.baʊnd/ | rebote |
| sparkling adjetivo | /ˈspɑɹkl̩ɪŋ/ | centelleante |
| isolate verbo | /ˈaɪ.sə.leɪt/ | aislar |
| backyard sustantivo | /bækˈjɑːd/ | traspatio, patio trasero |
| blower sustantivo | /ˈbloʊ.ɚ/ | fuelle, ventilador |
| mallet sustantivo | /ˈmælɪt/ | mazo |
| rupture sustantivo | /ˈɹʌpt͡ʃɚ/ | rotura |
| superpower sustantivo | superpotencia, hiperpotencia | |
| cushion sustantivo | /ˈkʊʃən/ | cojín, almohadón |
| cavity sustantivo | /ˈkæv.ɪt.i/ | cavidad |
Phrasal verbs que vas a escuchar
| Palabra | Significado |
|---|---|
| figure out verbo | averiguar, captar |
| turn out verbo | resultar |
| break out verbo | escapar forzadamente, fugarse |
| find out verbo | averiguar, anoticiarse |
| follow through verbo | cumplir |
Gramática en este vídeo
Las estructuras que más usa el hablante, con las palabras exactas del vídeo:
| Estructura | En el vídeo |
|---|---|
| Present perfect have/has + participio pasado — una acción pasada que sigue importando ahora | I've heard · we've put · we've isolated |
| Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hace | is filled · is carbonated · is confirmed |
Pronunciación a tener en cuenta
El hablante usa 30 contracciones y formas reducidas, como we're, don't, gonna. Dilas en su forma corta, tal como las oyes.
- Palabras largas — cuida el acento: carbonated /ˈkɑɹ.bəˌneɪ.təd/, momentum /ˌmə(ʊ)ˈmɛntəm/
Sonidos difíciles para hispanohablantes:
- s + consonante al inicio — sin añadir una “e” delante: snowball /ˈsnoʊbɔl/, sparkling /ˈspɑɹkl̩ɪŋ/, slam /ˈslæm/
- /v/ — no es /b/: los dientes tocan el labio inferior: vacuum /ˈvæ.kjuːm/, vapor /ˈveɪpɚ/, cavity /ˈkæv.ɪt.i/, believer /bɪˈlivɚ/, convert /kənˈvɝt/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Empieza a velocidad 0,75×, haz shadowing frase por frase y vuelve a la velocidad normal cuando te resulte fácil.
- Grábate y compara con el original, prestando atención a palabras como vacuum, carbonated, vapor.
¿Qué es la Técnica de Shadowing?
Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.