Get your Action Lab Box Now!
Source on negative Kelvin:
In this video I show you what it means to have negative temperature by focusing a laser beam down to a single point. I show you what happens if you try to focus a light down to a single point, then I show you how a laser is different due to population inversion.
Follow me on Twitter:
Facebook:
My Other Channel:
For more awesome videos checkout:
Darker Than Vantablack—Absorbs 99.9923% of Light
Amazing experiment actually makes black fire
Crushing My Own Hand In a Hydraulic Press—Crazy Experiment on My Brain
What Does a 4D Ball Look Like in Real Life? Amazing Experiment Shows Spherical Version of Tesseract
How I Made an Ant Think It Was Dead—The Zombie Ant Experiment
What Happens if You Open a Vacuum Chamber Under Water? And Do Vacuums Float?
Can Light be Black? Mind-Blowing Dark Light Experiments!
Mirror-Polished Japanese Foil Ball Challenge Crushed in a Hydraulic Press-What’s Inside?
Mixing the World’s Blackest Paint With the World’s Brightest Paint (Black 2.0 vs LIT)
Is it Possible to Unboil an Egg? The Amazing Uncooking Experiment!
What if You Try To Lift a Negative Mass? Mind-Blowing Physical Impossibility!
What Does a Giant Monster Neodymium Magnet do to a Mouse?
The Worlds Blackest Black vs The Worlds Brightest Flashlight (32,000 lumen)—Which Will Win?
How Much Weight Can a Fly Actually Lift? Experiment—I Lassoed a Fly!
DISCLAIMER: Any experiment you try is at your own risk
Nguồn: https://ngtba.org/
Xem thêm bài viết khác: https://ngtba.org/game/
Xem thêm Bài Viết:
- [ Highlights SN VS BLG – GAME 3 ] SN LẬT KÈO KINH ĐIỂN – SOFM MVP VỚI TRUNDLE DỰNG CỘT BĂNG MAX CHÍ
- Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy Deluxe Edition Part 1 Prologue!
- Mycaruba Shirt! ONE WEEK ONLY!
- We head to an NBA Game – Bobblehead Night
- Florida Gator Gameday Traditions 2014
I see a lot of people are having trouble with this video. First, I am very much aware that the reason the laser it getting hotter when it is magnified is due to the reduced area. That isn't the point of this video. The point is to try to explain why it doesn't break the laws of thermodynamics! Now for the negative kelvin explanation, statistical mechanics tells us that at infinite temperature all atomic states will be populated equally. The Kelvin scale was built upon classical mechanics where it would be impossible to achieve a state in which there are more atoms in a higher state than a lower state. However due to quantum mechanical effects, we know that we can stimulate atoms to be in a higher energy state simply by shining light near them that is at the same wavelength as the light it would emit at that state (stimulated emission). So in a laser, the stimulated atoms actually achieve a population inversion where there are more atoms in a higher energy state than a lower one. This is where the negative temperature comes from. In this case we have to define temperature as negative or else we get into problems that break the second law of thermodynamics. It doesn’t matter that my laser has poor optics. What’s important is that lasers can break the conservation of etendue due to the fact that they have light that doesn’t spread, the reason they have light that doesn’t spread is because of population inversion, and this is why we have to say they have negative temperatures (or they behave as if they have negative kelvin). We can never achieve negative temperature in a non-quantum mechanical system thus anything the laser shines on is always at a positive temperate no matter how hot you get.
Of course the reason the laser gets hotter when it’s focused is due to the reduced surface area of the light. That was not my point though. The point of the video was to explain why it doesn’t break the 2nd law of thermodynamics. Please research “conservation of etendue” to understand why you can’t focus a flashlight down to a point that is hotter/brighter than the flashlight surface. This is a very good example of how the second law of thermodynamics can never be broken no matter how hard you try.
please tell the glass you used here
Suggest the beginning of laser guns
Imagine if you pointed it at the eye
There is a small magnifying lens on the end of your laser that you can adjust by simply unscrewing the lens cap or screwing on the lens cap. By doing this you can tweak the point of the laser to a smaller, finer, hotter point. Then you can do away with your second or hand held magnifying lens. Be careful this gets very hot and burns thru even plywood if left long enough.
Thought this was a video where he cuts stuff in half with lasers…..
My disappointment is immeasurable and my day is ruined.
Why didn't you just use a reflective tube?
Shine the light into a reflective tube, heck… tinfoil and cardboard should work… and place your magnifier lens at the end, that should do the trick for focusing your flashlight at a shorter distance
this can also work with the sun on a hot day with no clouds. i tried it and i burned a leaf XD
So a curious question, what occurs if a laser is passed from one level of magnification to a stronger magnification? Think of eyeglass lenses for example, stepping up the magnification strength from one lense to the next? Can the negative temperature be stronger?
I don't like Kelvin anymore.
I feel if you take I cylinder tube that has an aluminum covering around the light you could probably keep all that light down to a small point without losing any
*Styropyro wants to know your location *
This reminded me of "Final Destination 5"
7:44
stop at the right milisecond and laugh
Amazing
FRICK THE LAWS OF PHYSICS,let's double jump,if that's even possible.:(.
I believe that's a 1W not a 7W
2:20
Is that really a problem?
Who got more confused?
Your fridge actually warms food in Antarctica.
That laser is actually 1.4 watts not 5 because if it was five it would easily blind him. I know this because I have the exact same laser and I also have a watt measure and its 1.4 not 5
Scientists: 2nd law of thermodynamics
People: what about laser?
Scientists: … Make it negative
Now try it with the last prism.
1:55 I was literally JUST, about to make a mean comment about how u were wrong. But you had to put that caption up didn’t u?!?!
The highest temperature is not Infinity, it's the Planck temperature. Although it might seem unlimited, because the more Energy you put in, the hotter it should get, calculations break down above this temperature.
It's roughly 1,416 784(16) · 10^32 Kelvin.
HOLY !! The Comment Section is ToXic…………………….
Quantum mechanics:
* Violates general relativity *
* Respects thermodynamics *
The only thing that is infinitely hot is hot pockets.
when you say negative temperature, are you exactly saying that as we get colder and colder, temperature becomes hot? because yah know – degrees are usually cold outside. i'm kinda confused.
Use fresnel and magifier
You Said In You’re Thumbnail That It’s Hotter Than Infinity. Well That’s Not But A Lightsaber Is.
Eh.. That explanation as to why the second law of thermodynamics isn't broken by lasers feels like a cop out..😂
Hey dude I made the flashlight Brighter than the actual lens itself because of a special type of flashlight
Use a concave lense directly in front of the flashlight, then a second convex one a couple of inches away
You made a mistake when you introduced second law of thermodynamics. you are focusing the energy, therefore theoretically you can get infinitely big intensivity if your area is infinitely small
Now imagine what the government can do with the newest technology and like unlimited cash……. I kinda want to know if there is a lazer that cuts trough anything like butter
Can't you use 2 glasses for the flashlight? One close to narrow the light in and one far to focus
2:33 i think some youtubers might disagree with that
Guys go check out styropyro hopefully you will sub him.
styropyro: "DID I HEAR LASERS?"
The Highest temperature We have on earth is 100 billion degree Celsius and You need -400°~ c to cool the Super magnets around them.
There is no way a 5 w laser can Reach temperatures hotter than that.(The temperature of the 'artificial sun' is 4 to 5 times greater than our own sun
So yeah)
P.s Im saying this at from the intro mark
So this might change later on
I think it's one of the things that's easier to understand on a theoretical model than with the experiment. I mean both laser emitter and flashlight produce additional heat
What if you focused the laser through a magnifying glass, and than focused that through another magnifying glass, and so on