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What Happens if You Focus a 5W Laser With a Giant Magnifying Glass? Negative Kelvin Temperature! | Wonderdir


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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.

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  1. Louis Bove says

    Great video!! But can you please explain the negative temps, and the difference between 0K and -0K

  2. Yohannes Mitiku says

    You have good constraint but please don't show your face

  3. DeadlyPunisher66 says

    Why is the laser the lightsaber from Star Wars I bought from dollar tree?

  4. ProTron gaming says

    Why does he always look like some one is constantly crop dusting him

  5. Gohan says

    i thought it was just about the density of the light.. am i wrong?
    so.. the wood was burning cuz of the laser.. but then you got the light from the laser to a smaller point.. which means more dense.. and the wood started burning faster… no?

  6. Brandon M says

    What about a 50 watt laser o_0

  7. shazam says

    Quantum Physics ~ Astronomy Based on science
    Quantum Mechanics ~ Astrology Based on beliefs

  8. Da Pro says

    What if you used multiple magnifying glases to focus more the laser's light?

  9. MyNameIsAjLEGEND says

    Stop freakin blinking so damn much

  10. Ir R says

    Your comments SHOW your comprehension to be false regarding photonic concept of light. I corrected a hot young post doc on a similar idiocy regarding difraction. Laser distance does not increase photonic pressure or surface mass energizing aka heating but does provide space for difraction of a minimally curved difracting material to concentrate DUH.

    LEDs are small to limit photonic inhalation BUT density increases on mouser.com ROUTINELY not just in lab. Your EXPENSIVE flashlight seems undeserved given it's power ro confuse you. Paradigms not understood as paradigms are dogma and your tail stinks so wagging.

    YOUR flashlight can be lensed. To suggest otherwise is to get it wrong AND bring contempt to the method.

  11. Huynh Tri Nguyen says

    In your last video, the spinner is in the middle so the fastest flow water is in the middle so the vortex is in the middle then why if you stir a cup of water from the outside and the vortex is in the middle.

  12. Ensign Jones says

    Yo. So wheres my action lab loot crate?

  13. The Marshal says

    So cold it burns, -X° K (X stands for anything from zero to infinity)

  14. DATONALKY says


  15. DrivingPower says

    I saw you on outrageous acts of science!!!! U put urself in a bag and someone sucked the air out and u only lasted 30 secs before breaking free! U are lucky to have survived.

  16. John S says

    Try using a light that is measured in lux not lumens it will have a tighter beam

  17. kaius says

    brightness = temperature?

  18. David Pugh says

    Each time I watch I think "I enjoy your work". My next move is I learn something.

  19. SogWaffle says

    Where can I get that laser?

  20. dale carter says

    You are not hitting the mark. The lens of the flash light is expanding light while your magnifying glass is contracting the light. The light bending power of the of the lens on the flash light is greater than that of the magnifying glass lens. Look at your L.E.D.s and note the lenses. The point here has less to do with thermodynamics than what you are implying. Take for example a lit match and a sliver of magnesium the lit match is burning at a much lower temperature than the sliver of magnesium will burn once it is lit by the burning match. But wait, are these two fires not from the same source. Yes they are, one burns tremendously hotter and faster than the other. Both fires are from the same source. Here is where thermodynamics comes in. Ignition of the fuel source can begin at a lower temperature than what the fuel source will burn at, however there is a limit to how hot the fire will burn from that one fuel source. Add another type of fuel source with a higher temperature burn, you get a hotter fire. Now if you are talking about heat conductivity of an element or alloy, thermodynamic law dictates that the end in the fire/source can not be exceeded in temperature by the end out of the fire. This does not aply to nonconductives such as light. Light is the product of a source, it is unlike flame, a thing unto itself. Once it is created it remains the same until it hit something and is either obsorbed or redirected or reflected. However, it can be concentrated or diluted/spread out. Ergo light while it can be a source of ignition is not a heat conducting element. Therefore, not subject to thermodynamics law.

  21. Praveen b says

    As far as the laser beam is concerned, that absolutely HUMONGOUS magnifying glass is just a distraction. You could cut away most of the glass and it would still work exactly the same, as long as the lens diameter is larger than the beam diameter.

    The actual laser source inside the device is an approximate point source radiating a cone of about 30 degrees. There is ALREADY a little lens inside that is carefully adjusted to focus that cone into a parallel beam. You will probably find that the lens is mounted on a threaded ring that you can re-adjust. You can then burn stuff by adjusting it so the narrowest part of the beam is like 1/2 meters away.

    Finally, what I said about the lens inside applies directly only to red lasers. In green / blue lasers they start with an ultraviolet laser and convert it down, so the optical elements would be more complicated. However, if we don't find a small adjustable lens right at the output, we can add one outside — but it doesn't need to be like Sherlock Holmes on steroids. It could be as small as a Barbie doll's contact lens.

  22. The uncle Rukus says

    Why are u so smart

  23. Lane Robertson says

    The positive and negative infinity temperatures seem really asymptotic.

  24. Gift of God says

    I want to tell other people this, but knowing my luck, it's either completely wrong or something everyone else already knows. (That's usually what happens when I learn something new.)

  25. dale carter says

    This guy tries to sound smart, but he either doesn't have a full grasp on what he is talking about, or……………

  26. electrodacus says

    Unbelievable how many mistakes there are in this video. I wanted to comment about them but there are to many mistakes just ignore all this video and watch better channels.

  27. Stefan Reich says

    Wow that's confusing

  28. Kavita Singh says

    focus 10 lasers …

  29. MrZapp20 says

    iluminaty confirmed

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