Diana: "Why it’s impossible to make a red bubble… or IS it?!" *Vsauce Theme intensifies*

8:32 where it cancels out and enhances over and over is frickin awesome good luck with independence!

I enjoy the “in the moment” explanation. It would probably NOT be better in an animation. The way you do it is easier to abstract. Great video

Dianna, you've always been so bubbly. Excited for your next videos! YOU GOT THIS 🔭

Diana: "Why it’s impossible to make a red bubble… or IS it?!" VSauce: Finally, a worthy opponent! Our battle will be legendary!

Jumping over to Patreon to do what I should have done already.

Honestly Diana is the only thing keeping me going towards my stem degree at this point

"If you don't trust me" I wouldn't be here if I didn't trust The Physics Girl.

6:47 Is that shade being thrown in a discussion about how wave interference can result in the cancellation of certain colours? Meta. EDIT: Oh wow, your lead-in hinted at it but that announcement at the end actually caught me off guard. Wishing you loads of luck and oodles of fun with the channel moving forward! That would explain the animation budget :P

I wonder how many times she said "string theory" in the outtakes.

“Suspicious, huh?” 😂 Dianna is adorable!

3:11 The thing shown as an example of a "coating, like of paint," is not a coating of paint; but it IS a coating. That's a naturally-occurring crystalline form of bismuth. The iridescence on the surface is oxidation.

Try sneezing with a nosebleed. :(

It's really PBS's loss. She's one of those presentators who's enthusiasm and sense of wonder makes others interested and they, themselves, ask why things are the way they appear. Glad to hear it's not an end but rather the beginning of another chapter.

Excellent explanation. Understanding bubbles and colour helped when I encountered dichroic filters. That is a whole other madness! Good luck with your solo venture.

"where was I?" You were being adorable

I was so relieved when you said you were still carrying on your channel. I thought we were going to lose you and that would have been awful. All the best.

9:45 Diana, you scared the bejesus out of me for a second there.

All the very best for the future Dianna!!! Thanks for inspiring me and soooo many other children to persue there passion for physics....

I remember reading QED by Richard Feynman where he talks about this with his little clock analogy

This same phenomenon is used to determine the atomic and molecular structure of a solid/crystal. The field is called diffractometry, and it can be done not only with photons (light) but also with, for example, electrons or neutrons

I'm sure we are all going to love your newly independent channel, good luck!

I recommend your videos to my students, they're so fun and well explained. Looking forward to many more of them

I love your stuff and look forward to any new vid you bring out. I make it a habit of showing them to my grandchildren. Very intertaining, informative, and yet easy to understand. Please keep up the awesome content. Good luck.

Me: the math behind this is awesome and surprisingly useful. Also me: colors pretty! (Sidenote: here's an idea, try this with 2 wavelengths, one at half of the other.)

So eyes with different configurations of receptors see soap bubbles differently? If you're an animal with many more than three color receptor types, bubbles must look even more amazing!

Omg. Decades ago, now... I was in Gifted/Talented summer school and did a segment with bubbles. We focused on things like water tension and how you could actually pass things through bubbles so long as they has solution on them too. It was fun! Closest we got to red bubbles was by mixing some colorant (paint or some dye?) Into bubble solution and then blowing bubbles onto a bit sheet of paper. Made an art.

Your enthusiasm and playfulness is so contagious and delightful. It's always a joy to watch your videos, especially for me as a physics teacher. I wish you so much success and joy for your future! :)

If only you were my physics teacher in high school, you would have been one of my favorite teachers!

If you guys want to have some fun, try watching the shadows of bubbles when you shine a flashlight on them!

Really enjoyed the presentation (including string manipulation); even the bits I already knew (e.g. oil bubbles) were compelling. I also wear anti-reflective coating on my spectacles which works the same way and STILL did not work out "why not red?" until your big reveal. I worked out a red laser would see a red bubble but I did NOT guess how interesting the result would be! thank you!

Always excited to watch your videos. They are always extremely clear and easy to follow :)

:O whoa congratulations!!! How can we support you outside of financial contributions on patreon?

This video is well timed. I was just looking at oil sheen on the ground yesterday and thought about asking you to explain why oil sheen looks rainbowy Now I don't have to

Wonderful !!! I'll show it to the students in my class. I made a video showing this effect on the wings of the morpho butterflies. The blue on these wings is an interference color. You can see shades of green as well.

I'm so glad you're continuing your youtube channel even though you're no longer with PBS, I love your videos

You’ve led me down a rabbit hole I’m not fully prepared to travel down... 😂

Pause screen at 0:32 and look at the pattern on the bubble. A cute heart is in the center upside down

Hello from Argentina ! Good luck on this new solo phase, we'll still be here. I love the videos, I can keep hours watching them, except I've already seen most of them so not anymore haha. I have a Physics question for you: 've had this question for a long long time which no one could answer me yet. I don't know if it is Physics or Chemistry, you let me know. But have you noticed how colors left in the sun just fade away? I'm not sure if all colors, outdoor furniture usually break before. But I've had like decorative bowls and drawings in paper left for YEARS outside, and they eventually end up all "white" (or whatever the object's base color was). Once it even happened with a drawing which was always inside but behind a window which got a lot of light.

That was very cool, especially with the strings, but I think there is an error in one of the asides. It is suggested that the light crests of waves of a given frequency aren't all aligned (in phase), but that cancellation can happen in two-layer reflection between pairs that are. However, let's apply essentially the same argument to the case of single-layer reflection: the light crests aren't all anti-aligned (180 degrees out of phase), but cancellation can happen in single-layer reflection between pairs that are. That would imply almost no light is reflected from a single layer! So, one has to either explain double-layer reflection in terms of a single wave solution (wave picture), or interference of a photon with itself (particle picture).

Dianna has Severe long-term covid. Share and support her please

"so much light that some cancels out with others" This isn't quite right. Even if you had a really dim source of light, such that 2 photons never touched the film at the same time, you could still see the colours in a long exposure photo. What is really happening is that each photon is being split into a superposition of bouncing off the front and back of the film, and going through. And light waves can destructively interfere with their own superpositions.

This is the second video of yours's that I've watched and had to sub. Love your energy and such a smile that I'm sure you could walk into a room of angry people and within minutes everyone would ne happy and smiling. The way you explain everything doesn't leave questions and confusion. So awesome channel !!

09:09 - Eeek! ... oh, phew! Good luck with the future outside of PBS! Here's to many more years of Happy Physicsing !

My face is full of red bubbles 😔

7:20 Oh so that's how iphone x got its wallpaper,😂

Excited to see where things go from here. I love how excited you always are in these videos, it's what keeps me coming back.

Nicely done. One light wave. The surface of the bubble doesn't reflect all the light from a wave. Some reflects from the top surface, some from the bottom surface (2 beam splitters). The color is brightest when the film is 1/2 wavelength (1/2 in, half out, adds), dimmer at 1 1/2, 2 1/2, 3 1/2, wavelength, etc. as the second beam is attenuated by the bubble material.

8:40 those are called Newton's rings! 🤓

THE MOST SURPRISING THING: WE LEARN THIS ON 11TH GRADE IN SOUTH KOREA

Okay, the part at the end with the striping because of the varying thickness of the bubble that caught me off guard. Very cool!

We use this in spectacle lens coatings (and in other optics). The coatings are a quarter of a wavelength thick so the reflection from the back of the coating cancels out. We refer to them as anti-reflective coatings.

Nice. I come for the jokes on the end card, but the videos are always good :-)

"If you search red bubble" It's some company

You are amazing Dianna and your experiments are wonderful and amazing....... Really this episode of making bubbles is also amazing........ 😍😍😍😍

That was excellent. You can do massive projects with all kinds of complicated equipment, or you can sit at a desk playing with soapy water and string, and either way you're engaging, entertaining, and very very informative. Keep on keeping on, and good luck with your new direction.

Double-slit experiment? Nah, just make some bubbles and see the strips of light

Missed opportunity for a sponsorship deal on this one.

I have been watching for the longest time, I am excited to see you move on. And I love how enthusiastic and bubbly you are about every video topic, you have soo much fun with it!

We use the thin film properties of constructive and deconstructive interference to create anti-reflective coatings on camera lenses and eyeglasses. You found a great way to present this effect. Thanks for posting.

@Physics Girl Hi Dianna! I'm glad you made a video about soap bubbles and color, which is one of my favorite things. But guess what. You *can* get red in a soap bubble with white light. You just need a certain light source. Specifically the common *triphosphor fluorescent* light bulbs or tubes. I actually used Kaleidagraph to graph the intensity of the colors in thin soap films, based on the mathematics of interference (adding sine waves together with a phase shift). I have actually been able to accurately predict the colors in the soap bubble all the way out to 1500 nanometers or so, and the colors repeat after about 1600 nanometers. This is assuming the fluorescent light illumination, and a refractive index of 1.35 for the film. At about *800-850 nanometers,* there is a spot where the 611.5 nanometer spike, and 630 nanometer area of the fluorescent light add together, and most other colors, except one peak at 488 nanometers, cancel. This creates a red-like color I like to call "interesting red". So there's actually no reason that you can't get red in a soap bubble. You just need a light source with *discrete* emission spectra (rather than the continuous incandescence of the sun and light bulbs). And as long as those wavelengths are in the right place, red can appear. It's really cool! Thanks for the great video, and talking about something I've found fascinating for a long time!

Fun fact: Your blood is red, and if you drink Coca Cola, it will stay red

I'm so proud of you for going out on your own takes a lot of courage keep up the great videos

Congratulations and good luck in your future. Love watching your vids. Keep up the great work.

Seems like physics girl is turning into a woman 🥴. For a moment I thought she was going to mention that she's getting married🥴. Don't pay attention, just rubbish bubbling up my mind without red.

And in this video, we see Diana attempt to explain why you don't normally see red bubbles using string theory

It's kinda cool that in the middle of one light demonstration (1:48), the Rolling-Shutter effect and the LED pulsing is shown in the horizontal lines in the reflected light.

Really interesting video, as always. you could even talk a little bit about Rayleigh scattering and why sky is blue and sometimes it appears reddish.

You project a total enjoyment in doing this video. Wonderful. Thank you!

This was cool, and something I wouldn't have guessed ... also well explained and animated lol. Wow, you're making quite a leap, congrats and I'm looking forward to seeing what you do moving forward =)

Another amazing video, best of luck stepping out on your own Dianna. Can't wait to see what's next 😊

That part at 8:59 was especially illuminating where presence or absence of red matched the different colours in white light.

This video blew my mind, sooo cool!! I love how I now know why there are stripes especially in a bubble because it's so fascinating!

We’re so proud of you!!! Awesome and exciting content!!! Looking forward to more.

Best of lucks in this new stage! we'll be here rooting for you and enjoying your videos as always.

You are so brave to go at it on your own. Thanks for the great channel, I for one will definitely be sticking with you.

I hope your future ventures are everything you want them to be! You keep making the videos, I'll keep watching!

You make things really easy to understand. I love your videos.

Good explanation. enough detail to give an accurate explanation, without being confusing.

So glad the Physics Girl videos will be continuing! Best wishes to you! :)

Okay. I’m usually really good at following your videos. But this one melted my brain!! Amazing video!! Me and my daughter LOVE your content!!

Great video! Learned so much! Thank you and good luck on your new endeavors. All the best! :)

My daughter insisted we send you a compliment. She says: thank you for teaching us science and I can’t wait until I understand it more. And I hope you make more science videos. Bye!

Wow bombshell! Congratulations and good for you! Great work as always Dianna!!

You're like a cross between the teacher I always wanted (your passion for science is super contagious) and Alyson Hannigan from her American Pie days. And my science understanding is only high school graduate level, but it's enough to keep up....mostly. Thank you for sharing science with your gift

I am a big fan and love your videos. Happy you are keeping your channel. Looking forward to your future videos.

Love you girl! showed us again something what is in front of our eyes, and we didn't see/remark it! i saw so much times bubbles, and didn't remarked the red missing! Vow! have to check it....

Woohoo! Go Dianna! Power to you. Love your content and hope you keep growing and producing such marvellous stuff :)

So, I knew about thin films and colors and such, but I am SO GLAD I watched! I've never seen the bands of red light. That was AWESOME! Thank you so much for doing that experiment!

You go girl...ur doing a great job. Easy to follow, and understand. And you're not boring..your'e alive..if only I had teachers you in science..52 yrs ago..

"Oh no. Pleh." Best of your video edits, thanks. Made me smile today.

Good for a backward travelling wave and forward travelling wave and very nice explanation is the young double slit experiment

@Physics Girl Also, what's really cool is that you can actually *predict* what light source someone is using for illumination, even without being able to see it directly. I've found that the order of colors in a soap bubble is different for triphosphor fluorescent lights, LED lights, halophosphate fluorescent lights, incandescent light bulbs, and daylight. I can predict *very accurately* which of these light sources it is, just by looking at the order of soap bubble colors.

It took me a few days but I finally got to finishing the video.....OMG! Congratulations and I’m excited for you! I look forward to seeing the first video of Physicsgirl Production studio!

Thanks! I was wondering about this exact thing recently

Infectious and physics are two words not usually associated with each other. You, Physics Girl, make learning about physics infectious.

Wow, this is amazing and fascinating! 👍🏼😀 Well done.

Diana i love your videos and I wish all the best for you. Nothing can stop you,YOU GOT THIS

Thank you Diana, I enjoy your videos.

Hi, Dianna, I love your videos but I just can't help correcting you on this one. Separate waves of light do not interfere with each other. Interference is only possible between waves that belong to the same photon. A lot of people get this wrong: unlike sound or water waves, light does not behave like a vibration in some medium. You would not be able to let two lasers cancel each other out (though I would love to see you try). What you CAN do, is send one laser beam through a beam splitter and let those two resulting beams interfere with each other. That's because each photon will be traveling through both beams simultaneously (in the form of probability waves) and those pairs of waves will interfere just like in the double split experiment. Watch Richard Feynman's QED lectures for an excellent explanation of how this works. So what's happening in the soap bubble is that individual photons are bouncing off BOTH sides of the bubble surface (just like photons going through both slits in the double split experiment), and the waves associated with those two paths of the same photon are interfering with each other. If those waves cancel each other out, the probability of observing that photon becomes zero.