Shadowing Practice: Bare Hand Bottle Busting- Science Investigation - Learn English Speaking with Video
Les maken...
1
- 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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Woordenschat en spreektips bij deze les
Deze spreekles op niveau B2 is gebaseerd op de video “Bare Hand Bottle Busting- Science Investigation”. Deze woorden komen het vaakst terug: bottle, break, vacuum, liquid, bottom. Deze video bevat 57 zinnen en 948 woorden om na te spreken. Het gesproken deel duurt 5:25. De spreker praat in een natuurlijk tempo van ongeveer 175 woorden per minuut, dicht bij een alledaags gesprek. 85% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden; de rest kun je beter vooraf bekijken.
Belangrijke woorden in deze video
De 15 moeilijkste woorden uit de video, met uitspraak en betekenis:
| Woord | Uitspraak | Betekenis |
|---|---|---|
| vacuum zelfstandig naamwoord | /ˈvæ.kjuːm/ | vacuüm |
| carbonated bijvoeglijk naamwoord | /ˈkɑɹ.bəˌneɪ.təd/ | bruisend, sprankelend |
| vapor zelfstandig naamwoord | /ˈveɪpɚ/ | damp |
| bubble zelfstandig naamwoord | /ˈbʌbəl/ | bel |
| snowball zelfstandig naamwoord | /ˈsnoʊbɔl/ | sneeuwbal |
| isolate werkwoord | /ˈaɪ.sə.leɪt/ | isoleren |
| backyard zelfstandig naamwoord | /bækˈjɑːd/ | achtertuin |
| superpower zelfstandig naamwoord | grootmacht, supermacht | |
| cushion zelfstandig naamwoord | /ˈkʊʃən/ | kussen |
| cavity zelfstandig naamwoord | /ˈkæv.ɪt.i/ | gaatje, gat |
| believer zelfstandig naamwoord | /bɪˈlivɚ/ | gelovige |
| impress werkwoord | /ɪmˈpɹɛs/ | imponeren, indruk maken |
| dense bijvoeglijk naamwoord | /ˈdɛns/ | dicht |
| slam werkwoord | /ˈslæm/ | toeslaan |
| momentum zelfstandig naamwoord | /ˌmə(ʊ)ˈmɛntəm/ | impuls |
Phrasal verbs die je zult horen
| Woord | Betekenis |
|---|---|
| figure out werkwoord | uitvogelen, er achter komen |
| turn out werkwoord | uitvallen, resulteren |
| come back werkwoord | terugkomen |
| find out werkwoord | ontdekken, onderzoeken |
| go back werkwoord | teruggaan |
Grammatica in deze video
De structuren die de spreker het meest gebruikt, met de exacte woorden uit de video:
| Structuur | In de video |
|---|---|
| Present perfect have/has + voltooid deelwoord — iets uit het verleden dat nu nog telt | I've heard · we've put · we've isolated |
| Lijdende vorm be + voltooid deelwoord — het gaat om wat er gebeurt, niet om wie het doet | is filled · is carbonated · is confirmed |
Uitspraak om op te letten
De spreker gebruikt 30 samentrekkingen en verkorte vormen, zoals we're, don't, gonna. Spreek ze kort uit, zoals je ze hoort.
- Lange woorden — let op de klemtoon: carbonated /ˈkɑɹ.bəˌneɪ.təd/, momentum /ˌmə(ʊ)ˈmɛntəm/
Klanken die Nederlandstaligen lastig vinden:
- Stemhebbende eindmedeklinker — /b/, /d/, /g/, /z/, /v/ niet verscherpen: carbonated /ˈkɑɹ.bəˌneɪ.təd/, rebound /ˈɹi.baʊnd/, backyard /bækˈjɑːd/
- /æ/ — opener dan de Nederlandse “e”: vacuum /ˈvæ.kjuːm/, backyard /bækˈjɑːd/, mallet /ˈmælɪt/, cavity /ˈkæv.ɪt.i/, slam /ˈslæm/
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Begin op 0,75× snelheid, spreek zin voor zin na en ga terug naar normale snelheid zodra het makkelijk gaat.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als vacuum, carbonated, vapor.
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.