शैडोइंग अभ्यास: Bare Hand Bottle Busting- Science Investigation - वीडियो के साथ अंग्रेजी बोलना सीखें

- Today I am here with Kevin, more commonly known as the Backyard Scientist.

And as fate would have it, we are actually in- - The backyard.

- 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.

- So as soon as I got here today, we- But flaming snowballs aren't actually why I'm here today.

Show 'em why I'm here today, Kevin.

So I actually don't drink, but I've heard of people doing this with beer bottles.

So either Kevin has some superpowers, or there's some crazy physics going on there that we're gonna try and figure out today.

- 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.

- So as firm believers in the scientific method, we are going to science our way to the right answer through a bunch of experiments.

- I'll drink to that.

- 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.

- 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.

So we've put a cap on the top, so there's no way to force air in.

We're using a rubber mallet just to be more consistent for all of the hits.

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.

- We think carbonation might have something to do with it.

- Okay so to isolate that, we have one beer that's carbonated, one with water, and then we filled this one with sparkling water.

So if these two don't break and this one breaks, I think we've isolated that it works better without carbonation.

- Yes. - So this bottle is filled with sparkling water, so the theory is that it shouldn't break.

And now for the beer, the bottle didn't break, but that was interesting how much it fizzed up.

So as it turns out, here's why that happens.

When you hit the bottle, it moves down really fast, but the liquid hasn't started moving yet.

That creates an empty gap down here, that's basically a vacuum or really low pressure.

And if the drink is carbonated, the CO2 from the liquid gets sucked into that vacuum and fills it with CO2 gas bubbles.

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.

Now finally, we test the water, and just like with the carbonated liquids, you see this vacuum form on the bottom.

Except this time the bottle breaks.

So theory number two is confirmed, non-carbonated liquids work better.

But now we just have to figure out why.

What are they doing differently to make the bottle actually break?

- 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.

- And I think the break is happening a little bit earlier.

When the vacuum is formed like the air outside is at 14 PSI and so it's pushing in on the vacuum.

So it's before the water rebounds, it's actually cracking because the difference in pressure.

- Well we'll find out.

- Round three. Fight!

- 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.

One. So if I'm right, okay, bottle, it should break right there.

- No. - Yes! - You punk.

Yeah so you're definitely right.

- Yeah. - It ruptured when the water is coming back right?

- Cracks right after it hits the bottom.

- 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.

So now that you know the science, if you want to impress your friends with this trick, here are a couple important tips.

Number one, hit the bottle and not your hand.

You want to make as much energy from your strike go into moving the bottle and not just being reacted by your hand.

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.

Number two, like we discovered, use water or something non-carbonated.

Otherwise, the carbonation just fills in that vacuum and cushions the rebound force.

Number three, a liquid with a high vapor pressure is good.

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.

Nail polish remover also works well for the same reason.

Number four, be safe, this is glass, and glass can cut you if you're not careful where it lands.

Number five, don't chicken out.

It hurts way more if you don't follow through.

Plus you look like this.

- Oh, I heard it. Did it hurt?

📺 उसी चैनल से

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इस पाठ की शब्दावली और बोलने के सुझाव

यह B2 स्तर का स्पीकिंग पाठ वीडियो “Bare Hand Bottle Busting- Science Investigation” पर आधारित है। सबसे ज़्यादा दोहराए गए शब्द ये हैं: bottle, break, vacuum, liquid, bottom। इस वीडियो में शैडोइंग के लिए 57 वाक्य और 948 शब्द हैं। बोला गया हिस्सा 5:25 लंबा है। वक्ता लगभग 175 शब्द प्रति मिनट की स्वाभाविक गति से बोलता है, जो रोज़मर्रा की बातचीत के करीब है। 85% शब्द अंग्रेज़ी के 3,000 सबसे आम शब्दों में से हैं; बाकी शब्द अभ्यास से पहले देख लेना अच्छा रहेगा।

इस वीडियो की मुख्य शब्दावली

वीडियो के 15 सबसे कठिन शब्द, उच्चारण और अर्थ के साथ:

शब्द	उच्चारण	अर्थ
vacuum संज्ञा	/ˈvæ.kjuːm/	निर्वात
vapor संज्ञा	/ˈveɪpɚ/	भाप, भभका
bubble संज्ञा	/ˈbʌbəl/	बुलबुला, बुल्ला
snowball संज्ञा	/ˈsnoʊbɔl/	स्नोबॉल, बर्फ़ का गोला
sparkling विशेषण	/ˈspɑɹkl̩ɪŋ/	चमक
backyard संज्ञा	/bækˈjɑːd/	बगिया
rupture संज्ञा	/ˈɹʌpt͡ʃɚ/	दरार
superpower संज्ञा		परमशक्ति
cushion संज्ञा	/ˈkʊʃən/	तकिया, बालिश
believer संज्ञा	/bɪˈlivɚ/	आस्तिक, मूमिन
dense विशेषण	/ˈdɛns/	घना
momentum संज्ञा	/ˌmə(ʊ)ˈmɛntəm/	संवेग
flame संज्ञा	/fleɪm/	लौ, ज्वाला
collapse क्रिया	/kəˈlæps/	गिरना
precisely क्रिया विशेषण	/pɹɪˈsaɪs.li/	यथार्थतः, यथावत्

वीडियो में आने वाली फ़्रेज़ल वर्ब

शब्द	अर्थ
come back क्रिया	वापस आना

इस वीडियो का व्याकरण

वक्ता जिन संरचनाओं का सबसे अधिक प्रयोग करता है, वीडियो के असली शब्दों के साथ:

संरचना	वीडियो में
Present perfect have/has + past participle — बीता हुआ काम जिसका असर अभी भी है	I've heard · we've put · we've isolated
Passive voice be + past participle — ज़ोर इस पर कि क्या होता है, न कि कौन करता है	is filled · is carbonated · is confirmed

ध्यान देने योग्य उच्चारण

वक्ता 30 बार संक्षिप्त रूपों का प्रयोग करता है, जैसे we're, don't, gonna। इन्हें वैसे ही छोटा बोलें जैसा आप सुनते हैं।

लंबे शब्द — बलाघात सही रखें: carbonated /ˈkɑɹ.bəˌneɪ.təd/, momentum /ˌmə(ʊ)ˈmɛntəm/

हिंदी भाषियों के लिए मुश्किल ध्वनियाँ:

/v/ और /w/ का फ़र्क़ — /v/ में ऊपर के दाँत निचले होंठ को छूते हैं, /w/ में होंठ गोल होते हैं: vacuum /ˈvæ.kjuːm/, vapor /ˈveɪpɚ/, cavity /ˈkæv.ɪt.i/, believer /bɪˈlivɚ/, convert /kənˈvɝt/
शब्द की शुरुआत में s + व्यंजन — पहले “इ” न जोड़ें: snowball /ˈsnoʊbɔl/, sparkling /ˈspɑɹkl̩ɪŋ/, slam /ˈslæm/
/æ/ — “ऐ” से ज़्यादा खुला: vacuum /ˈvæ.kjuːm/, backyard /bækˈjɑːd/, mallet /ˈmælɪt/, cavity /ˈkæv.ɪt.i/, slam /ˈslæm/

इस वीडियो से अभ्यास कैसे करें

पहले बिना बोले पूरा वीडियो एक बार सुनें और जो शब्द नहीं आते उन्हें लिख लें।
0.75× गति से शुरू करें, एक-एक वाक्य की शैडोइंग करें, और सहज लगने पर सामान्य गति पर लौटें।
अपनी आवाज़ रिकॉर्ड करें और मूल से तुलना करें, ख़ासकर vacuum, vapor, bubble जैसे शब्दों पर ध्यान दें।

शैडोइंग तकनीक क्या है?

शैडोइंग (Shadowing) एक विज्ञान-समर्थित भाषा सीखने की तकनीक है जो मूल रूप से पेशेवर दुभाषिया प्रशिक्षण के लिए विकसित की गई थी। विधि सरल लेकिन शक्तिशाली है: आप मूल अंग्रेज़ी ऑडियो सुनते हैं और तुरंत इसे ज़ोर से दोहराते हैं — जैसे वक्ता की छाया 1-2 सेकंड की देरी से। शोध से पता चलता है कि यह उच्चारण सटीकता, स्वर, लय, जुड़ी हुई ध्वनियाँ, सुनने की समझ और बोलने की प्रवाहशीलता में काफ़ी सुधार करता है।

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शैडोइंग अभ्यास: Bare Hand Bottle Busting- Science Investigation - वीडियो के साथ अंग्रेजी बोलना सीखें

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इस पाठ की शब्दावली और बोलने के सुझाव

इस वीडियो की मुख्य शब्दावली

वीडियो में आने वाली फ़्रेज़ल वर्ब

इस वीडियो का व्याकरण

ध्यान देने योग्य उच्चारण

इस वीडियो से अभ्यास कैसे करें

शैडोइंग तकनीक क्या है?