Studying an Air Vortex Cannon / Mr. Denjiro's Happy Energy!

DENJIRO: This is an episode of the four-part "Summer Vacation Science Project Special." We’re almost halfway through summer vacation now. Today's theme is this: the air vortex cannon. Let's shoot the cannon at a target.
The air that leaves the cannon is knocking down targets. But we can't see the air that is being shot out. So let's make these bullets of air visible. I'll first teach you how to make an air vortex cannon. You first need a cardboard box like this. Tape tightly the openings of the box with tape. Don't forget to tape the inside as well. We don't want the flaps inside to move. Next, you make a hole from which air will exit. Once you make the hole, the cannon is ready, but there's one more important point.
We're going to bend the corners like so. This will make it easier to push air out of the cannon. Hold the cannon with one arm, and use the other hand to push the folded side in to fire the air inside the box.
Let's now make the air vortex cannon bullets visible. We will put incense smoke inside the box. Let's fire the cannon.
GIRL: I see a ring of smoke!
DENJIRO: As you can see, we've made the bullet flying in the air visible. If you look closely, you can see that the smoke spins as it travels. The bullet of an air cannon flies as it pulls air from the inside to outside of the ring. This is called a vortex ring. It is this vortex that allows the ring to travel straight.
NARRATOR: When recording the flying vortex ring using a smartphone, make the room dark and shine light only at the travelling ring for best results. Try different amounts of smoke and levels of light intensity to observe the motion of the ring.
DENJIRO: I hope energy will bring you all happiness. Our magic word is "Happy Energy!"

[@土矢アキラ]

相変わらずCGのように見える空気砲のリングが何度見ても楽しい。

[@BTR-l1z]

見えない空気砲で的を倒す先生の視線が完全に殺し屋

[@rnugi_rice]

でんじろう先生と言えば空気砲だよね

[@最強ムウマージ]

空気砲といって思い浮かぶのはでんじろう先生とドラえもんぐらい

[@k_ris2]

それなw

[@whitesweetp9605]

原点にして頂点。

[@しづい額賀]

やっぱりエイムが良すぎるww

[@hikaru23723]

エイムがいいって言うよねまぁ空気砲の空気の範囲が大きいからねマジレス(？)ごめん

[@Zokusenoshimenjyu]

ナルトっていえば螺旋丸
でんじろうっていえば空気砲

[@みみん-y6p]

空気砲すご〜い✨

[@コーセー-s8u]

伝家の宝刀　空気砲

[@KS-vq5sq]

1:45ここスゴい

[@HMSvuangaadph]

最強兵器…どっかで見たような。、、

[@azumaoka]

先生、凄い楽しそうwww

[@mmmm-po1nb]

家で出来るなんて！楽しそう、やってみたいです。

[@chacodesu2575]

原点の最強兵器

[@ヤタ-l5q]

でんじろう先生の持ち武器

[@不良中年-v6h]

左右にある空気砲から出たそれぞれの煙が正面衝突したら、どうなるのかなぁ？
やっぱり、煙だけに霧散するのかなぁ？

[@myki7138]

めちゃイケ警察でこれを顔面に連射してた先生マジサイコパス

[@tetra5093]

煙の輪が見えるううう↑↑↑↑↑↑↑↑

[@やそ-y1k]

3分じゃ無いだと？

[@----602]

テッテレー♪
空気砲〜♪

[@YuhiSunset]

原 点 回 帰

[@エレキ-q1q]

空気砲ってこんなに単純なんだーー

[@kamespinosarojas9225]

omg they are going to beat Gandalf on smoke art.😮

[@萩原-m6t]

なんか今回の動画テンション低いな
でんじろう空気砲作るの飽きてるのかな

[@SamoArinan]

先生の持ちネタ

[@tukurumon01]

煙の輪が見えるって言ってる子だれだ？

[@aaaaaa987654]

鬼に金棒

[@BokuMomblo]

Sepi

[@Kae_Love_R]

十八番

[@kaillias6182]

いま有吉の壁みて絶対調べた人いると思う

[@にゃん太くん-f7q]

こいつ許さん

[@三日月ハル-e6j]

先ほど、コイルガンの実験をやっていましたが犯罪に使われそうでとても怖かったです。
他にこの実験を紹介する方法はなかったのでしょうか？

[@axlworld724]

？？

[@kaillias6182]

いま有吉の壁みて絶対調べた人いると思う